38991079 has 4 divisors (see below), whose sum is σ = 39072960. Its totient is φ = 38909200.

The previous prime is 38991061. The next prime is 38991089. The reversal of 38991079 is 97019983.

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 38991079 - 2⁷ = 38990951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38991019) 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, 40222 + ... + 41179.

It is an arithmetic number, because the mean of its divisors is an integer number (9768240).

Almost surely, 2^38991079 is an apocalyptic number.

38991079 is a deficient number, since it is larger than the sum of its proper divisors (81881).

38991079 is an equidigital number, since it uses as much as digits as its factorization.

38991079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81880.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 38991079 is about 6244.2837059186. The cubic root of 38991079 is about 339.0952850670.

The spelling of 38991079 in words is "thirty-eight million, nine hundred ninety-one thousand, seventy-nine".