38609865 has 40 divisors (see below), whose sum is σ = 79104960. Its totient is φ = 17648928.

The previous prime is 38609861. The next prime is 38609897. The reversal of 38609865 is 56890683.

38609865 is a `hidden beast` number, since 38 + 609 + 8 + 6 + 5 = 666.

It is not a de Polignac number, because 38609865 - 2² = 38609861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 38609865.

It is not an unprimeable number, because it can be changed into a prime (38609861) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3975 + ... + 9644.

It is an arithmetic number, because the mean of its divisors is an integer number (1977624).

Almost surely, 2^38609865 is an apocalyptic number.

38609865 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

38609865 is an abundant number, since it is smaller than the sum of its proper divisors (40495095).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

38609865 is a wasteful number, since it uses less digits than its factorization.

38609865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13643 (or 13634 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 38609865 is about 6213.6836900505. The cubic root of 38609865 is about 337.9865574757.

The spelling of 38609865 in words is "thirty-eight million, six hundred nine thousand, eight hundred sixty-five".