399679280 has 480 divisors, whose sum is σ = 1367912448. Its totient is φ = 106444800.

The previous prime is 399679277. The next prime is 399679289. The reversal of 399679280 is 82976993.

It is a super-2 number, since 2×399679280² = 319487053722636800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399679289) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12892865 + ... + 12892895.

Almost surely, 2^399679280 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 399679280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (683956224).

399679280 is an abundant number, since it is smaller than the sum of its proper divisors (968233168).

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

399679280 is a wasteful number, since it uses less digits than its factorization.

399679280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 92 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 53.

The square root of 399679280 is about 19991.9803921472. The cubic root of 399679280 is about 736.6093233098.

The spelling of 399679280 in words is "three hundred ninety-nine million, six hundred seventy-nine thousand, two hundred eighty".