38939431 has 4 divisors (see below), whose sum is σ = 40282200. Its totient is φ = 37596664.

The previous prime is 38939419. The next prime is 38939443. The reversal of 38939431 is 13493983.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (38939419) and next prime (38939443).

It is a cyclic number.

It is not a de Polignac number, because 38939431 - 2⁵ = 38939399 is a prime.

It is a super-2 number, since 2×38939431² = 3032558573207522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38939491) 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, 671341 + ... + 671398.

It is an arithmetic number, because the mean of its divisors is an integer number (10070550).

Almost surely, 2^38939431 is an apocalyptic number.

38939431 is a deficient number, since it is larger than the sum of its proper divisors (1342769).

38939431 is a wasteful number, since it uses less digits than its factorization.

38939431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342768.

The product of its digits is 69984, while the sum is 40.

The square root of 38939431 is about 6240.1467130189. The cubic root of 38939431 is about 338.9454958303.

The spelling of 38939431 in words is "thirty-eight million, nine hundred thirty-nine thousand, four hundred thirty-one".