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389881 = 439067
BaseRepresentation
bin1011111001011111001
3201210211001
41133023321
544434011
612205001
73212452
oct1371371
9653731
10389881
11246a18
12169761
131085cb
14a2129
157a7c1
hex5f2f9

389881 has 4 divisors (see below), whose sum is σ = 398992. Its totient is φ = 380772.

The previous prime is 389867. The next prime is 389891. The reversal of 389881 is 188983.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 389881 - 25 = 389849 is a prime.

It is a super-2 number, since 2×3898812 = 304014388322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 389881.

It is not an unprimeable number, because it can be changed into a prime (389891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4491 + ... + 4576.

It is an arithmetic number, because the mean of its divisors is an integer number (99748).

2389881 is an apocalyptic number.

389881 is the 361-st hex number.

It is an amenable number.

389881 is a deficient number, since it is larger than the sum of its proper divisors (9111).

389881 is an equidigital number, since it uses as much as digits as its factorization.

389881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9110.

The product of its digits is 13824, while the sum is 37.

The square root of 389881 is about 624.4045163193. The cubic root of 389881 is about 73.0540039498.

The spelling of 389881 in words is "three hundred eighty-nine thousand, eight hundred eighty-one".

Divisors: 1 43 9067 389881