399499360 has 192 divisors, whose sum is σ = 1085918400. Its totient is φ = 137797632.

The previous prime is 399499357. The next prime is 399499361. The reversal of 399499360 is 63994993.

399499360 = T₁₅₅ + T₁₅₆ + ... + T₁₃₃₈.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a junction number, because it is equal to n+sod(n) for n = 399499298 and 399499307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399499361) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2231751 + ... + 2231929.

It is an arithmetic number, because the mean of its divisors is an integer number (5655825).

Almost surely, 2^399499360 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399499360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (542959200).

399499360 is an abundant number, since it is smaller than the sum of its proper divisors (686419040).

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

399499360 is a wasteful number, since it uses less digits than its factorization.

399499360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 1417176, while the sum is 52.

The square root of 399499360 is about 19987.4800812909. The cubic root of 399499360 is about 736.4987758051.

The spelling of 399499360 in words is "three hundred ninety-nine million, four hundred ninety-nine thousand, three hundred sixty".