399743712 has 72 divisors (see below), whose sum is σ = 1203654816. Its totient is φ = 125408256.

The previous prime is 399743689. The next prime is 399743719. The reversal of 399743712 is 217347993.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399743719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35928 + ... + 45719.

It is an arithmetic number, because the mean of its divisors is an integer number (16717428).

Almost surely, 2^399743712 is an apocalyptic number.

399743712 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

399743712 is an abundant number, since it is smaller than the sum of its proper divisors (803911104).

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

399743712 is a wasteful number, since it uses less digits than its factorization.

399743712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81680 (or 81669 counting only the distinct ones).

The product of its digits is 285768, while the sum is 45.

The square root of 399743712 is about 19993.5917733658. The cubic root of 399743712 is about 736.6489039303.

The spelling of 399743712 in words is "three hundred ninety-nine million, seven hundred forty-three thousand, seven hundred twelve".