388491630 has 64 divisors (see below), whose sum is σ = 944516160. Its totient is φ = 102260736.

The previous prime is 388491629. The next prime is 388491637. The reversal of 388491630 is 36194883.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388491637) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1325764 + ... + 1326056.

It is an arithmetic number, because the mean of its divisors is an integer number (14758065).

Almost surely, 2^388491630 is an apocalyptic number.

388491630 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

388491630 is an abundant number, since it is smaller than the sum of its proper divisors (556024530).

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

388491630 is a wasteful number, since it uses less digits than its factorization.

388491630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 388491630 is about 19710.1910188613. The cubic root of 388491630 is about 729.6712286966.

The spelling of 388491630 in words is "three hundred eighty-eight million, four hundred ninety-one thousand, six hundred thirty".