393121284 has 48 divisors (see below), whose sum is σ = 942841536. Its totient is φ = 127411200.

The previous prime is 393121241. The next prime is 393121291. The reversal of 393121284 is 482121393.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164619 + ... + 166989.

It is an arithmetic number, because the mean of its divisors is an integer number (19642532).

Almost surely, 2^393121284 is an apocalyptic number.

It is an amenable number.

393121284 is an abundant number, since it is smaller than the sum of its proper divisors (549720252).

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

393121284 is a wasteful number, since it uses less digits than its factorization.

393121284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756 (or 2754 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 393121284 is about 19827.2863498765. The cubic root of 393121284 is about 732.5582874017.

The spelling of 393121284 in words is "three hundred ninety-three million, one hundred twenty-one thousand, two hundred eighty-four".