393840992 has 24 divisors (see below), whose sum is σ = 776512800. Its totient is φ = 196631424.

The previous prime is 393840973. The next prime is 393841003. The reversal of 393840992 is 299048393.

It is a super-2 number, since 2×393840992² = 310221453959088128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14009 + ... + 31367.

It is an arithmetic number, because the mean of its divisors is an integer number (32354700).

Almost surely, 2^393840992 is an apocalyptic number.

393840992 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

393840992 is a deficient number, since it is larger than the sum of its proper divisors (382671808).

393840992 is a wasteful number, since it uses less digits than its factorization.

393840992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18078 (or 18070 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 393840992 is about 19845.4274834280. The cubic root of 393840992 is about 733.0050593155.

The spelling of 393840992 in words is "three hundred ninety-three million, eight hundred forty thousand, nine hundred ninety-two".