399706560 has 504 divisors, whose sum is σ = 1602077568. Its totient is φ = 91238400.

The previous prime is 399706537. The next prime is 399706589. The reversal of 399706560 is 65607993.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 10802862 + ... + 10802898.

Almost surely, 2^399706560 is an apocalyptic number.

399706560 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 399706560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (801038784).

399706560 is an abundant number, since it is smaller than the sum of its proper divisors (1202371008).

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

399706560 is a wasteful number, since it uses less digits than its factorization.

399706560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 306180, while the sum is 45.

The square root of 399706560 is about 19992.6626540839. The cubic root of 399706560 is about 736.6260819511.

The spelling of 399706560 in words is "three hundred ninety-nine million, seven hundred six thousand, five hundred sixty".