38139657 has 4 divisors (see below), whose sum is σ = 50852880. Its totient is φ = 25426436.

The previous prime is 38139649. The next prime is 38139677. The reversal of 38139657 is 75693183.

38139657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 38139657 - 2³ = 38139649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38139617) 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, 6356607 + ... + 6356612.

It is an arithmetic number, because the mean of its divisors is an integer number (12713220).

Almost surely, 2^38139657 is an apocalyptic number.

It is an amenable number.

38139657 is a deficient number, since it is larger than the sum of its proper divisors (12713223).

38139657 is a wasteful number, since it uses less digits than its factorization.

38139657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12713222.

The product of its digits is 136080, while the sum is 42.

The square root of 38139657 is about 6175.7312927296. The cubic root of 38139657 is about 336.6088997816.

The spelling of 38139657 in words is "thirty-eight million, one hundred thirty-nine thousand, six hundred fifty-seven".