400798513 has 2 divisors, whose sum is σ = 400798514. Its totient is φ = 400798512.

The previous prime is 400798501. The next prime is 400798523. The reversal of 400798513 is 315897004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227165184 + 173633329 = 15072^2 + 13177^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400798513 is a prime.

It is a super-2 number, since 2×400798513² = 321278896046022338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400798523) 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, 200399256 + 200399257.

It is an arithmetic number, because the mean of its divisors is an integer number (200399257).

Almost surely, 2^400798513 is an apocalyptic number.

It is an amenable number.

400798513 is a deficient number, since it is larger than the sum of its proper divisors (1).

400798513 is an equidigital number, since it uses as much as digits as its factorization.

400798513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 400798513 is about 20019.9528720724. The cubic root of 400798513 is about 737.2962650102.

The spelling of 400798513 in words is "four hundred million, seven hundred ninety-eight thousand, five hundred thirteen".