399492449 has 2 divisors, whose sum is σ = 399492450. Its totient is φ = 399492448.

The previous prime is 399492421. The next prime is 399492517. The reversal of 399492449 is 944294993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 293505424 + 105987025 = 17132^2 + 10295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399492449 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 399492449.

It is not a weakly prime, because it can be changed into another prime (399492409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199746224 + 199746225.

It is an arithmetic number, because the mean of its divisors is an integer number (199746225).

Almost surely, 2^399492449 is an apocalyptic number.

It is an amenable number.

399492449 is a deficient number, since it is larger than the sum of its proper divisors (1).

399492449 is an equidigital number, since it uses as much as digits as its factorization.

399492449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2519424, while the sum is 53.

The square root of 399492449 is about 19987.3071973190. The cubic root of 399492449 is about 736.4945288460.

The spelling of 399492449 in words is "three hundred ninety-nine million, four hundred ninety-two thousand, four hundred forty-nine".