399615700 has 72 divisors (see below), whose sum is σ = 949314240. Its totient is φ = 144806400.

The previous prime is 399615683. The next prime is 399615703. The reversal of 399615700 is 7516993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399615703) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 475881 + ... + 476719.

It is an arithmetic number, because the mean of its divisors is an integer number (13184920).

Almost surely, 2^399615700 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 399615700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (474657120).

399615700 is an abundant number, since it is smaller than the sum of its proper divisors (549698540).

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

399615700 is a wasteful number, since it uses less digits than its factorization.

399615700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297 (or 1290 counting only the distinct ones).

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 399615700 is about 19990.3901912894. The cubic root of 399615700 is about 736.5702619033.

The spelling of 399615700 in words is "three hundred ninety-nine million, six hundred fifteen thousand, seven hundred".