393281390 has 16 divisors (see below), whose sum is σ = 716437008. Its totient is φ = 155416896.

The previous prime is 393281387. The next prime is 393281401. The reversal of 393281390 is 93182393.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236087 + ... + 237746.

It is an arithmetic number, because the mean of its divisors is an integer number (44777313).

Almost surely, 2^393281390 is an apocalyptic number.

393281390 is a deficient number, since it is larger than the sum of its proper divisors (323155618).

393281390 is a wasteful number, since it uses less digits than its factorization.

393281390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473923.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 393281390 is about 19831.3234555841. The cubic root of 393281390 is about 732.6577232612.

The spelling of 393281390 in words is "three hundred ninety-three million, two hundred eighty-one thousand, three hundred ninety".