399490560 has 240 divisors, whose sum is σ = 1581836256. Its totient is φ = 91275264.

The previous prime is 399490549. The next prime is 399490571. The reversal of 399490560 is 65094993.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (399490549) and next prime (399490571).

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×399490560² = 319185415058227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 160042 + ... + 162518.

Almost surely, 2^399490560 is an apocalyptic number.

399490560 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399490560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790918128).

399490560 is an abundant number, since it is smaller than the sum of its proper divisors (1182345696).

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

399490560 is a wasteful number, since it uses less digits than its factorization.

399490560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2513 (or 2494 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 399490560 is about 19987.2599422732. The cubic root of 399490560 is about 736.4933680061.

The spelling of 399490560 in words is "three hundred ninety-nine million, four hundred ninety thousand, five hundred sixty".