388978746 has 32 divisors (see below), whose sum is σ = 840829248. Its totient is φ = 119253120.

The previous prime is 388978703. The next prime is 388978747. The reversal of 388978746 is 647879883.

It is a self number, because there is not a number n which added to its sum of digits gives 388978746.

It is not an unprimeable number, because it can be changed into a prime (388978747) 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, 13045 + ... + 30791.

It is an arithmetic number, because the mean of its divisors is an integer number (26275914).

Almost surely, 2^388978746 is an apocalyptic number.

388978746 is an abundant number, since it is smaller than the sum of its proper divisors (451850502).

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

388978746 is a wasteful number, since it uses less digits than its factorization.

388978746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18046.

The product of its digits is 16257024, while the sum is 60.

The square root of 388978746 is about 19722.5441056675. The cubic root of 388978746 is about 729.9760710240.

The spelling of 388978746 in words is "three hundred eighty-eight million, nine hundred seventy-eight thousand, seven hundred forty-six".