38131979 has 4 divisors (see below), whose sum is σ = 38219280. Its totient is φ = 38044680.

The previous prime is 38131949. The next prime is 38131987. The reversal of 38131979 is 97913183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97913183 = 17 ⋅5759599.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38131979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38131909) 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, 42992 + ... + 43869.

It is an arithmetic number, because the mean of its divisors is an integer number (9554820).

Almost surely, 2^38131979 is an apocalyptic number.

38131979 is a deficient number, since it is larger than the sum of its proper divisors (87301).

38131979 is an equidigital number, since it uses as much as digits as its factorization.

38131979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87300.

The product of its digits is 40824, while the sum is 41.

The square root of 38131979 is about 6175.1096346543. The cubic root of 38131979 is about 336.5863103757.

The spelling of 38131979 in words is "thirty-eight million, one hundred thirty-one thousand, nine hundred seventy-nine".