386990784 has 140 divisors (see below), whose sum is σ = 1207846200. Its totient is φ = 122176512.

The previous prime is 386990777. The next prime is 386990797. The reversal of 386990784 is 487099683.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 386990784.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 96532 + ... + 100460.

Almost surely, 2^386990784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 386990784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (603923100).

386990784 is an abundant number, since it is smaller than the sum of its proper divisors (820855416).

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

386990784 is a wasteful number, since it uses less digits than its factorization.

386990784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3972 (or 3953 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The square root of 386990784 is about 19672.0813337074. The cubic root of 386990784 is about 728.7303783699.

The spelling of 386990784 in words is "three hundred eighty-six million, nine hundred ninety thousand, seven hundred eighty-four".