390215891440 has 20 divisors (see below), whose sum is σ = 907251947784. Its totient is φ = 156086356544.

The previous prime is 390215891407. The next prime is 390215891467. The reversal of 390215891440 is 44198512093.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2438849242 + ... + 2438849401.

Almost surely, 2^390215891440 is an apocalyptic number.

It is an amenable number.

390215891440 is an abundant number, since it is smaller than the sum of its proper divisors (517036056344).

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

390215891440 is a wasteful number, since it uses less digits than its factorization.

390215891440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4877698656 (or 4877698650 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 390215891440 in words is "three hundred ninety billion, two hundred fifteen million, eight hundred ninety-one thousand, four hundred forty".