399492649 has 2 divisors, whose sum is σ = 399492650. Its totient is φ = 399492648.

The previous prime is 399492637. The next prime is 399492671. The reversal of 399492649 is 946294993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 266505625 + 132987024 = 16325^2 + 11532^2 .

It is a cyclic number.

It is not a de Polignac number, because 399492649 - 2¹¹ = 399490601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399492649.

It is not a weakly prime, because it can be changed into another prime (399492679) 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, 199746324 + 199746325.

It is an arithmetic number, because the mean of its divisors is an integer number (199746325).

Almost surely, 2^399492649 is an apocalyptic number.

It is an amenable number.

399492649 is a deficient number, since it is larger than the sum of its proper divisors (1).

399492649 is an equidigital number, since it uses as much as digits as its factorization.

399492649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3779136, while the sum is 55.

The square root of 399492649 is about 19987.3122004936. The cubic root of 399492649 is about 736.4946517510.

The spelling of 399492649 in words is "three hundred ninety-nine million, four hundred ninety-two thousand, six hundred forty-nine".