38431857 has 4 divisors (see below), whose sum is σ = 51242480. Its totient is φ = 25621236.

The previous prime is 38431823. The next prime is 38431859. The reversal of 38431857 is 75813483.

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: 75813483 = 3 ⋅25271161.

It is not a de Polignac number, because 38431857 - 2¹² = 38427761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38431859) 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, 6405307 + ... + 6405312.

It is an arithmetic number, because the mean of its divisors is an integer number (12810620).

Almost surely, 2^38431857 is an apocalyptic number.

It is an amenable number.

38431857 is a deficient number, since it is larger than the sum of its proper divisors (12810623).

38431857 is a wasteful number, since it uses less digits than its factorization.

38431857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12810622.

The product of its digits is 80640, while the sum is 39.

The square root of 38431857 is about 6199.3432716700. The cubic root of 38431857 is about 337.4663362857.

The spelling of 38431857 in words is "thirty-eight million, four hundred thirty-one thousand, eight hundred fifty-seven".