388346820 has 48 divisors (see below), whose sum is σ = 1116765888. Its totient is φ = 100759680.

The previous prime is 388346813. The next prime is 388346821. The reversal of 388346820 is 28643883.

It is a super-2 number, since 2×388346820² = 301626505208224800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (388346821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85246 + ... + 89685.

It is an arithmetic number, because the mean of its divisors is an integer number (23265956).

Almost surely, 2^388346820 is an apocalyptic number.

388346820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

388346820 is an abundant number, since it is smaller than the sum of its proper divisors (728419068).

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

388346820 is a wasteful number, since it uses less digits than its factorization.

388346820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174980 (or 174978 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 42.

The square root of 388346820 is about 19706.5171960953. The cubic root of 388346820 is about 729.5805559391.

It can be divided in two parts, 38834 and 6820, that added together give a palindrome (45654).

The spelling of 388346820 in words is "three hundred eighty-eight million, three hundred forty-six thousand, eight hundred twenty".