38889431 has 4 divisors (see below), whose sum is σ = 44445072. Its totient is φ = 33333792.

The previous prime is 38889427. The next prime is 38889449. The reversal of 38889431 is 13498883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13498883 = 1031 ⋅13093.

It is a cyclic number.

It is not a de Polignac number, because 38889431 - 2² = 38889427 is a prime.

It is a super-2 number, since 2×38889431² = 3024775687007522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38889491) 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, 2777810 + ... + 2777823.

It is an arithmetic number, because the mean of its divisors is an integer number (11111268).

Almost surely, 2^38889431 is an apocalyptic number.

38889431 is a deficient number, since it is larger than the sum of its proper divisors (5555641).

38889431 is an equidigital number, since it uses as much as digits as its factorization.

38889431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555640.

The product of its digits is 165888, while the sum is 44.

The square root of 38889431 is about 6236.1391100584. The cubic root of 38889431 is about 338.8003598827.

The spelling of 38889431 in words is "thirty-eight million, eight hundred eighty-nine thousand, four hundred thirty-one".