38791979 has 4 divisors (see below), whose sum is σ = 39176160. Its totient is φ = 38407800.

The previous prime is 38791957. The next prime is 38791997. The reversal of 38791979 is 97919783.

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

It is a cyclic number.

It is not a de Polignac number, because 38791979 - 2²⁴ = 22014763 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 38791979.

It is not an unprimeable number, because it can be changed into a prime (38791999) 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, 191939 + ... + 192140.

It is an arithmetic number, because the mean of its divisors is an integer number (9794040).

Almost surely, 2^38791979 is an apocalyptic number.

38791979 is a deficient number, since it is larger than the sum of its proper divisors (384181).

38791979 is a wasteful number, since it uses less digits than its factorization.

38791979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384180.

The product of its digits is 857304, while the sum is 53.

The square root of 38791979 is about 6228.3207207080. The cubic root of 38791979 is about 338.5171262045.

The spelling of 38791979 in words is "thirty-eight million, seven hundred ninety-one thousand, nine hundred seventy-nine".