Search a number
-
+
39313921 = 315712221
BaseRepresentation
bin1001010111111…
…0001000000001
32201222100120011
42111332020001
540031021141
63522344521
7655106563
oct225761001
981870504
1039313921
1120212149
12111bb141
1381b649a
145315333
1536b8881
hex257e201

39313921 has 8 divisors (see below), whose sum is σ = 40671488. Its totient is φ = 37962000.

The previous prime is 39313919. The next prime is 39313927. The reversal of 39313921 is 12931393.

39313921 = T5118 + T5119 + T5120.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39313921 - 21 = 39313919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39313927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16591 + ... + 18811.

It is an arithmetic number, because the mean of its divisors is an integer number (5083936).

Almost surely, 239313921 is an apocalyptic number.

39313921 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

39313921 is the 5120-th centered triangular number.

It is an amenable number.

39313921 is a deficient number, since it is larger than the sum of its proper divisors (1357567).

39313921 is a wasteful number, since it uses less digits than its factorization.

39313921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2823.

The product of its digits is 4374, while the sum is 31.

The square root of 39313921 is about 6270.0814189291. The cubic root of 39313921 is about 340.0286048598.

It can be divided in two parts, 3931392 and 1, that added together give a palindrome (3931393).

The spelling of 39313921 in words is "thirty-nine million, three hundred thirteen thousand, nine hundred twenty-one".

Divisors: 1 31 571 2221 17701 68851 1268191 39313921