390987440 has 20 divisors (see below), whose sum is σ = 909045984. Its totient is φ = 156394944.

The previous prime is 390987427. The next prime is 390987479. The reversal of 390987440 is 44789093.

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

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 390987391 and 390987400.

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, 2443592 + ... + 2443751.

Almost surely, 2^390987440 is an apocalyptic number.

It is an amenable number.

390987440 is an abundant number, since it is smaller than the sum of its proper divisors (518058544).

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

390987440 is a wasteful number, since it uses less digits than its factorization.

390987440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4887356 (or 4887350 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 390987440 is about 19773.4023374836. The cubic root of 390987440 is about 731.2304512757.

The spelling of 390987440 in words is "three hundred ninety million, nine hundred eighty-seven thousand, four hundred forty".