393901632 has 42 divisors (see below), whose sum is σ = 1129049558. Its totient is φ = 131300352.

The previous prime is 393901631. The next prime is 393901633. The reversal of 393901632 is 236109393.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (393901631) and next prime (393901633).

It can be written as a sum of positive squares in only one way, i.e., 318836736 + 75064896 = 17856^2 + 8664^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (393901631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 341353 + ... + 342504.

Almost surely, 2^393901632 is an apocalyptic number.

393901632 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

393901632 is an abundant number, since it is smaller than the sum of its proper divisors (735147926).

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

393901632 is a wasteful number, since it uses less digits than its factorization.

393901632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683875 (or 683862 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 36.

The square root of 393901632 is about 19846.9552324784. The cubic root of 393901632 is about 733.0426778355.

The spelling of 393901632 in words is "three hundred ninety-three million, nine hundred one thousand, six hundred thirty-two".