399504949 has 2 divisors, whose sum is σ = 399504950. Its totient is φ = 399504948.

The previous prime is 399504929. The next prime is 399504997. The reversal of 399504949 is 949405993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 256224049 + 143280900 = 16007^2 + 11970^2 .

It is a cyclic number.

It is not a de Polignac number, because 399504949 - 2⁷ = 399504821 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399504896 and 399504905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399504929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199752474 + 199752475.

It is an arithmetic number, because the mean of its divisors is an integer number (199752475).

Almost surely, 2^399504949 is an apocalyptic number.

It is an amenable number.

399504949 is a deficient number, since it is larger than the sum of its proper divisors (1).

399504949 is an equidigital number, since it uses as much as digits as its factorization.

399504949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1574640, while the sum is 52.

The square root of 399504949 is about 19987.6198933240. The cubic root of 399504949 is about 736.5022103308.

The spelling of 399504949 in words is "three hundred ninety-nine million, five hundred four thousand, nine hundred forty-nine".