399858912 has 72 divisors (see below), whose sum is σ = 1139340384. Its totient is φ = 133023744.

The previous prime is 399858839. The next prime is 399858917. The reversal of 399858912 is 219858993.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399858917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192793 + ... + 194855.

It is an arithmetic number, because the mean of its divisors is an integer number (15824172).

Almost surely, 2^399858912 is an apocalyptic number.

399858912 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399858912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (569670192).

399858912 is an abundant number, since it is smaller than the sum of its proper divisors (739481472).

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

399858912 is a wasteful number, since it uses less digits than its factorization.

399858912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2752 (or 2741 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 54.

The square root of 399858912 is about 19996.4724889166. The cubic root of 399858912 is about 736.7196607682.

The spelling of 399858912 in words is "three hundred ninety-nine million, eight hundred fifty-eight thousand, nine hundred twelve".