400699969 has 2 divisors, whose sum is σ = 400699970. Its totient is φ = 400699968.

The previous prime is 400699961. The next prime is 400700009. The reversal of 400699969 is 969996004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 378497025 + 22202944 = 19455^2 + 4712^2 .

It is a cyclic number.

It is not a de Polignac number, because 400699969 - 2³ = 400699961 is a prime.

It is a super-2 number, since 2×400699969² = 321120930313201922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400699961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200349984 + 200349985.

It is an arithmetic number, because the mean of its divisors is an integer number (200349985).

Almost surely, 2^400699969 is an apocalyptic number.

It is an amenable number.

400699969 is a deficient number, since it is larger than the sum of its proper divisors (1).

400699969 is an equidigital number, since it uses as much as digits as its factorization.

400699969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 944784, while the sum is 52.

The square root of 400699969 is about 20017.4915761191. The cubic root of 400699969 is about 737.2358339156.

The spelling of 400699969 in words is "four hundred million, six hundred ninety-nine thousand, nine hundred sixty-nine".