400899013 has 2 divisors, whose sum is σ = 400899014. Its totient is φ = 400899012.

The previous prime is 400899007. The next prime is 400899017. The reversal of 400899013 is 310998004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 302829604 + 98069409 = 17402^2 + 9903^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400899013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400899013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400899017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200449506 + 200449507.

It is an arithmetic number, because the mean of its divisors is an integer number (200449507).

Almost surely, 2^400899013 is an apocalyptic number.

It is an amenable number.

400899013 is a deficient number, since it is larger than the sum of its proper divisors (1).

400899013 is an equidigital number, since it uses as much as digits as its factorization.

400899013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 400899013 is about 20022.4627106657. The cubic root of 400899013 is about 737.3578854003.

The spelling of 400899013 in words is "four hundred million, eight hundred ninety-nine thousand, thirteen".