38891979 has 12 divisors (see below), whose sum is σ = 64202736. Its totient is φ = 22223952.

The previous prime is 38891977. The next prime is 38891989. The reversal of 38891979 is 97919883.

38891979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 38891979 - 2¹ = 38891977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38891977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308604 + ... + 308729.

It is an arithmetic number, because the mean of its divisors is an integer number (5350228).

Almost surely, 2^38891979 is an apocalyptic number.

38891979 is a deficient number, since it is larger than the sum of its proper divisors (25310757).

38891979 is a wasteful number, since it uses less digits than its factorization.

38891979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617346 (or 617343 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 38891979 is about 6236.3433997816. The cubic root of 38891979 is about 338.8077590178.

The spelling of 38891979 in words is "thirty-eight million, eight hundred ninety-one thousand, nine hundred seventy-nine".