399987570 has 16 divisors (see below), whose sum is σ = 959970240. Its totient is φ = 106663344.

The previous prime is 399987559. The next prime is 399987571. The reversal of 399987570 is 75789993.

It is a self number, because there is not a number n which added to its sum of digits gives 399987570.

It is not an unprimeable number, because it can be changed into a prime (399987571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6666430 + ... + 6666489.

It is an arithmetic number, because the mean of its divisors is an integer number (59998140).

Almost surely, 2^399987570 is an apocalyptic number.

399987570 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

399987570 is an abundant number, since it is smaller than the sum of its proper divisors (559982670).

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

399987570 is a wasteful number, since it uses less digits than its factorization.

399987570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13332929.

The product of its (nonzero) digits is 4286520, while the sum is 57.

The square root of 399987570 is about 19999.6892475858. The cubic root of 399987570 is about 736.7986675638.

The spelling of 399987570 in words is "three hundred ninety-nine million, nine hundred eighty-seven thousand, five hundred seventy".