Search a number
38881 = 59659
BaseRepresentation
bin1001011111100001
31222100001
421133201
52221011
6500001
7221233
oct113741
958301
1038881
1127237
121a601
131490b
1410253
15b7c1
hex97e1

38881 has 4 divisors (see below), whose sum is σ = 39600. Its totient is φ = 38164.

The previous prime is 38873. The next prime is 38891. The reversal of 38881 is 18883.

It is the 81-st star number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18883 = 23821.

It is a cyclic number.

It is not a de Polignac number, because 38881 - 23 = 38873 is a prime.

It is a super-2 number, since 2×388812 = 3023464322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271 + ... + 388.

It is an arithmetic number, because the mean of its divisors is an integer number (9900).

238881 is an apocalyptic number.

It is an amenable number.

38881 is a deficient number, since it is larger than the sum of its proper divisors (719).

38881 is an equidigital number, since it uses as much as digits as its factorization.

38881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718.

The product of its digits is 1536, while the sum is 28.

The square root of 38881 is about 197.1826564381. The cubic root of 38881 is about 33.8775874804.

It can be divided in two parts, 38 and 881, that added together give a palindrome (919).

The spelling of 38881 in words is "thirty-eight thousand, eight hundred eighty-one".

Divisors: 1 59 659 38881