388793790 has 128 divisors (see below), whose sum is σ = 1292682240. Its totient is φ = 80784000.

The previous prime is 388793777. The next prime is 388793803. The reversal of 388793790 is 97397883.

It is an interprime number because it is at equal distance from previous prime (388793777) and next prime (388793803).

It is a super-2 number, since 2×388793790² = 302321222285128200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11440 + ... + 30140.

It is an arithmetic number, because the mean of its divisors is an integer number (10099080).

Almost surely, 2^388793790 is an apocalyptic number.

388793790 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 388793790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (646341120).

388793790 is an abundant number, since it is smaller than the sum of its proper divisors (903888450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

388793790 is a wasteful number, since it uses less digits than its factorization.

388793790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18735 (or 18729 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The square root of 388793790 is about 19717.8545993219. The cubic root of 388793790 is about 729.8603535968.

The spelling of 388793790 in words is "three hundred eighty-eight million, seven hundred ninety-three thousand, seven hundred ninety".