404651749 has 2 divisors, whose sum is σ = 404651750. Its totient is φ = 404651748.

The previous prime is 404651669. The next prime is 404651783. The reversal of 404651749 is 947156404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 403809025 + 842724 = 20095^2 + 918^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404651749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404652749) 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, 202325874 + 202325875.

It is an arithmetic number, because the mean of its divisors is an integer number (202325875).

Almost surely, 2^404651749 is an apocalyptic number.

It is an amenable number.

404651749 is a deficient number, since it is larger than the sum of its proper divisors (1).

404651749 is an equidigital number, since it uses as much as digits as its factorization.

404651749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 404651749 is about 20115.9575710429. The cubic root of 404651749 is about 739.6514970866.

The spelling of 404651749 in words is "four hundred four million, six hundred fifty-one thousand, seven hundred forty-nine".