388440684 has 120 divisors (see below), whose sum is σ = 1086734880. Its totient is φ = 120559104.

The previous prime is 388440677. The next prime is 388440697. The reversal of 388440684 is 486044883.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 600049 + ... + 600695.

It is an arithmetic number, because the mean of its divisors is an integer number (9056124).

Almost surely, 2^388440684 is an apocalyptic number.

388440684 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 388440684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (543367440).

388440684 is an abundant number, since it is smaller than the sum of its proper divisors (698294196).

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

388440684 is a wasteful number, since it uses less digits than its factorization.

388440684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789 (or 778 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 45.

The square root of 388440684 is about 19708.8985993637. The cubic root of 388440684 is about 729.6393314366.

The spelling of 388440684 in words is "three hundred eighty-eight million, four hundred forty thousand, six hundred eighty-four".