399621068 has 48 divisors (see below), whose sum is σ = 889728000. Its totient is φ = 155690640.

The previous prime is 399621043. The next prime is 399621071. The reversal of 399621068 is 860126993.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1853 + ... + 28331.

It is an arithmetic number, because the mean of its divisors is an integer number (18536000).

Almost surely, 2^399621068 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 399621068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (444864000).

399621068 is an abundant number, since it is smaller than the sum of its proper divisors (490106932).

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

399621068 is a wasteful number, since it uses less digits than its factorization.

399621068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26515 (or 26499 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 399621068 is about 19990.5244553513. The cubic root of 399621068 is about 736.5735599815.

The spelling of 399621068 in words is "three hundred ninety-nine million, six hundred twenty-one thousand, sixty-eight".