38993815 has 32 divisors (see below), whose sum is σ = 55996416. Its totient is φ = 25505280.

The previous prime is 38993813. The next prime is 38993831. The reversal of 38993815 is 51839983.

It is not a de Polignac number, because 38993815 - 2¹ = 38993813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38993813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89839 + ... + 90271.

It is an arithmetic number, because the mean of its divisors is an integer number (1749888).

Almost surely, 2^38993815 is an apocalyptic number.

38993815 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

38993815 is a deficient number, since it is larger than the sum of its proper divisors (17002601).

38993815 is a wasteful number, since it uses less digits than its factorization.

38993815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559.

The product of its digits is 233280, while the sum is 46.

The square root of 38993815 is about 6244.5027824479. The cubic root of 38993815 is about 339.1032163085.

The spelling of 38993815 in words is "thirty-eight million, nine hundred ninety-three thousand, eight hundred fifteen".