388961838 has 24 divisors (see below), whose sum is σ = 873964728. Its totient is φ = 129653784.

The previous prime is 388961779. The next prime is 388961843. The reversal of 388961838 is 838169883.

It is a happy number.

It is a super-2 number, since 2×388961838² = 302582622840676488, 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 11 ways as a sum of consecutive naturals, for example, 399681 + ... + 400652.

It is an arithmetic number, because the mean of its divisors is an integer number (36415197).

Almost surely, 2^388961838 is an apocalyptic number.

388961838 is an abundant number, since it is smaller than the sum of its proper divisors (485002890).

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

388961838 is an equidigital number, since it uses as much as digits as its factorization.

388961838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800350 (or 800338 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The square root of 388961838 is about 19722.1154544841. The cubic root of 388961838 is about 729.9654940843.

The spelling of 388961838 in words is "three hundred eighty-eight million, nine hundred sixty-one thousand, eight hundred thirty-eight".