399873312 has 36 divisors (see below), whose sum is σ = 1137140550. Its totient is φ = 133291008.

The previous prime is 399873311. The next prime is 399873323. The reversal of 399873312 is 213378993.

It can be written as a sum of positive squares in only one way, i.e., 269091216 + 130782096 = 16404^2 + 11436^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (399873311) 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, 693937 + ... + 694512.

Almost surely, 2^399873312 is an apocalyptic number.

399873312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

399873312 is an abundant number, since it is smaller than the sum of its proper divisors (737267238).

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

399873312 is a wasteful number, since it uses less digits than its factorization.

399873312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388465 (or 1388454 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 399873312 is about 19996.8325491814. The cubic root of 399873312 is about 736.7285044173.

The spelling of 399873312 in words is "three hundred ninety-nine million, eight hundred seventy-three thousand, three hundred twelve".