399049092 has 120 divisors (see below), whose sum is σ = 1189736856. Its totient is φ = 115540992.

The previous prime is 399049061. The next prime is 399049093. The reversal of 399049092 is 290940993.

It can be written as a sum of positive squares in 4 ways, for example, as 1285956 + 397763136 = 1134^2 + 19944^2 .

It is not an unprimeable number, because it can be changed into a prime (399049093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 68818 + ... + 74390.

Almost surely, 2^399049092 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 399049092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (594868428).

399049092 is an abundant number, since it is smaller than the sum of its proper divisors (790687764).

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

399049092 is a wasteful number, since it uses less digits than its factorization.

399049092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5619 (or 5608 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 399049092 is about 19976.2131546497. The cubic root of 399049092 is about 736.2219739457.

The spelling of 399049092 in words is "three hundred ninety-nine million, forty-nine thousand, ninety-two".