399869310 has 64 divisors (see below), whose sum is σ = 1014902784. Its totient is φ = 100665600.

The previous prime is 399869303. The next prime is 399869311. The reversal of 399869310 is 13968993.

It is a happy number.

It is a super-2 number, since 2×399869310² = 319790930159752200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399869310.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399869311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32887 + ... + 43373.

It is an arithmetic number, because the mean of its divisors is an integer number (15857856).

Almost surely, 2^399869310 is an apocalyptic number.

399869310 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 399869310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (507451392).

399869310 is an abundant number, since it is smaller than the sum of its proper divisors (615033474).

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

399869310 is a wasteful number, since it uses less digits than its factorization.

399869310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10569.

The product of its (nonzero) digits is 314928, while the sum is 48.

The square root of 399869310 is about 19996.7324830833. The cubic root of 399869310 is about 736.7260466411.

The spelling of 399869310 in words is "three hundred ninety-nine million, eight hundred sixty-nine thousand, three hundred ten".