400798889 has 2 divisors, whose sum is σ = 400798890. Its totient is φ = 400798888.

The previous prime is 400798883. The next prime is 400798913. The reversal of 400798889 is 988897004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335512489 + 65286400 = 18317^2 + 8080^2 .

It is a cyclic number.

It is not a de Polignac number, because 400798889 - 2²⁸ = 132363433 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400798889.

It is not a weakly prime, because it can be changed into another prime (400798883) 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, 200399444 + 200399445.

It is an arithmetic number, because the mean of its divisors is an integer number (200399445).

Almost surely, 2^400798889 is an apocalyptic number.

It is an amenable number.

400798889 is a deficient number, since it is larger than the sum of its proper divisors (1).

400798889 is an equidigital number, since it uses as much as digits as its factorization.

400798889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 53.

The square root of 400798889 is about 20019.9622627017. The cubic root of 400798889 is about 737.2964955694.

The spelling of 400798889 in words is "four hundred million, seven hundred ninety-eight thousand, eight hundred eighty-nine".