399141992 has 8 divisors (see below), whose sum is σ = 748391250. Its totient is φ = 199570992.

The previous prime is 399141983. The next prime is 399142033. The reversal of 399141992 is 299141993.

It can be written as a sum of positive squares in only one way, i.e., 297010756 + 102131236 = 17234^2 + 10106^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24946367 + ... + 24946382.

Almost surely, 2^399141992 is an apocalyptic number.

It is an amenable number.

399141992 is a deficient number, since it is larger than the sum of its proper divisors (349249258).

399141992 is a wasteful number, since it uses less digits than its factorization.

399141992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49892755 (or 49892751 counting only the distinct ones).

The product of its digits is 157464, while the sum is 47.

The square root of 399141992 is about 19978.5382848696. The cubic root of 399141992 is about 736.2791011814.

Subtracting from 399141992 its reverse (299141993), we obtain a palindrome (99999999).

The spelling of 399141992 in words is "three hundred ninety-nine million, one hundred forty-one thousand, nine hundred ninety-two".