390255280 has 80 divisors (see below), whose sum is σ = 962152704. Its totient is φ = 146949120.

The previous prime is 390255253. The next prime is 390255319. The reversal of 390255280 is 82552093.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89634 + ... + 93886.

Almost surely, 2^390255280 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 390255280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (481076352).

390255280 is an abundant number, since it is smaller than the sum of its proper divisors (571897424).

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

390255280 is a wasteful number, since it uses less digits than its factorization.

390255280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4334 (or 4328 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 390255280 is about 19754.8799034568. The cubic root of 390255280 is about 730.7737339477.

The spelling of 390255280 in words is "three hundred ninety million, two hundred fifty-five thousand, two hundred eighty".