388937893 has 4 divisors (see below), whose sum is σ = 392947660. Its totient is φ = 384928128.

The previous prime is 388937839. The next prime is 388937897. The reversal of 388937893 is 398739883.

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

It can be written as a sum of positive squares in 2 ways, for example, as 204575809 + 184362084 = 14303^2 + 13578^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388937893 is a prime.

It is a super-2 number, since 2×388937893² = 302545369222558898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388937897) 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, 2004738 + ... + 2004931.

It is an arithmetic number, because the mean of its divisors is an integer number (98236915).

Almost surely, 2^388937893 is an apocalyptic number.

It is an amenable number.

388937893 is a deficient number, since it is larger than the sum of its proper divisors (4009767).

388937893 is an equidigital number, since it uses as much as digits as its factorization.

388937893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4009766.

The product of its digits is 7838208, while the sum is 58.

The square root of 388937893 is about 19721.5083855166. The cubic root of 388937893 is about 729.9505145664.

The spelling of 388937893 in words is "three hundred eighty-eight million, nine hundred thirty-seven thousand, eight hundred ninety-three".