38656913 has 4 divisors (see below), whose sum is σ = 39989940. Its totient is φ = 37323888.

The previous prime is 38656903. The next prime is 38656927. The reversal of 38656913 is 31965683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31965683 = 467 ⋅68449.

It can be written as a sum of positive squares in 2 ways, for example, as 22391824 + 16265089 = 4732^2 + 4033^2 .

It is a cyclic number.

It is not a de Polignac number, because 38656913 - 2¹⁰ = 38655889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38656903) 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, 666470 + ... + 666527.

It is an arithmetic number, because the mean of its divisors is an integer number (9997485).

Almost surely, 2^38656913 is an apocalyptic number.

It is an amenable number.

38656913 is a deficient number, since it is larger than the sum of its proper divisors (1333027).

38656913 is a wasteful number, since it uses less digits than its factorization.

38656913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333026.

The product of its digits is 116640, while the sum is 41.

The square root of 38656913 is about 6217.4683754724. The cubic root of 38656913 is about 338.1237861086.

The spelling of 38656913 in words is "thirty-eight million, six hundred fifty-six thousand, nine hundred thirteen".