393985972 has 12 divisors (see below), whose sum is σ = 691278336. Its totient is φ = 196477880.

The previous prime is 393985961. The next prime is 393985973. The reversal of 393985972 is 279589393.

It is a super-2 number, since 2×393985972² = 310449892265569568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393985973) 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, 127054 + ... + 130117.

It is an arithmetic number, because the mean of its divisors is an integer number (57606528).

Almost surely, 2^393985972 is an apocalyptic number.

It is an amenable number.

393985972 is a deficient number, since it is larger than the sum of its proper divisors (297292364).

393985972 is a wasteful number, since it uses less digits than its factorization.

393985972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257558 (or 257556 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 55.

The square root of 393985972 is about 19849.0798779188. The cubic root of 393985972 is about 733.0949924258.

The spelling of 393985972 in words is "three hundred ninety-three million, nine hundred eighty-five thousand, nine hundred seventy-two".