393121136 has 20 divisors (see below), whose sum is σ = 779386872. Its totient is φ = 191989056.

The previous prime is 393121123. The next prime is 393121139. The reversal of 393121136 is 631121393.

It is a junction number, because it is equal to n+sod(n) for n = 393121099 and 393121108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393121139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285011 + ... + 286386.

Almost surely, 2^393121136 is an apocalyptic number.

It is an amenable number.

393121136 is a deficient number, since it is larger than the sum of its proper divisors (386265736).

393121136 is a wasteful number, since it uses less digits than its factorization.

393121136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571448 (or 571442 counting only the distinct ones).

The product of its digits is 2916, while the sum is 29.

The square root of 393121136 is about 19827.2826176458. The cubic root of 393121136 is about 732.5581954719.

The spelling of 393121136 in words is "three hundred ninety-three million, one hundred twenty-one thousand, one hundred thirty-six".