388866540 has 96 divisors (see below), whose sum is σ = 1151377920. Its totient is φ = 97790976.

The previous prime is 388866529. The next prime is 388866571. The reversal of 388866540 is 45668883.

It is a self number, because there is not a number n which added to its sum of digits gives 388866540.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 299172 + ... + 300468.

It is an arithmetic number, because the mean of its divisors is an integer number (11993520).

Almost surely, 2^388866540 is an apocalyptic number.

388866540 is a gapful number since it is divisible by the number (30) 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 388866540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (575688960).

388866540 is an abundant number, since it is smaller than the sum of its proper divisors (762511380).

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

388866540 is a wasteful number, since it uses less digits than its factorization.

388866540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1591 (or 1589 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 48.

The square root of 388866540 is about 19719.6992877681. The cubic root of 388866540 is about 729.9058738963.

The spelling of 388866540 in words is "three hundred eighty-eight million, eight hundred sixty-six thousand, five hundred forty".