399368970 has 432 divisors, whose sum is σ = 1458003456. Its totient is φ = 74131200.

The previous prime is 399368969. The next prime is 399368989. The reversal of 399368970 is 79863993.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 12882855 + ... + 12882885.

It is an arithmetic number, because the mean of its divisors is an integer number (3375008).

Almost surely, 2^399368970 is an apocalyptic number.

399368970 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 399368970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (729001728).

399368970 is an abundant number, since it is smaller than the sum of its proper divisors (1058634486).

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

399368970 is a wasteful number, since it uses less digits than its factorization.

399368970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 54.

The square root of 399368970 is about 19984.2180232302. The cubic root of 399368970 is about 736.4186400697.

The spelling of 399368970 in words is "three hundred ninety-nine million, three hundred sixty-eight thousand, nine hundred seventy".