399849408 has 252 divisors, whose sum is σ = 1379232192. Its totient is φ = 110315520.

The previous prime is 399849407. The next prime is 399849413. The reversal of 399849408 is 804948993.

It is a tau number, because it is divible by the number of its divisors (252).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399849403) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 874716 + ... + 875172.

Almost surely, 2^399849408 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 399849408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (689616096).

399849408 is an abundant number, since it is smaller than the sum of its proper divisors (979382784).

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

399849408 is a wasteful number, since it uses less digits than its factorization.

399849408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 54.

The square root of 399849408 is about 19996.2348455903. The cubic root of 399849408 is about 736.7138238434.

The spelling of 399849408 in words is "three hundred ninety-nine million, eight hundred forty-nine thousand, four hundred eight".