400769969 has 2 divisors, whose sum is σ = 400769970. Its totient is φ = 400769968.

The previous prime is 400769959. The next prime is 400770011. The reversal of 400769969 is 969967004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 400600225 + 169744 = 20015^2 + 412^2 .

It is a cyclic number.

It is not a de Polignac number, because 400769969 - 2²⁸ = 132334513 is a prime.

It is a super-2 number, since 2×400769969² = 321233136104521922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400769909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200384984 + 200384985.

It is an arithmetic number, because the mean of its divisors is an integer number (200384985).

Almost surely, 2^400769969 is an apocalyptic number.

It is an amenable number.

400769969 is a deficient number, since it is larger than the sum of its proper divisors (1).

400769969 is an equidigital number, since it uses as much as digits as its factorization.

400769969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 50.

The square root of 400769969 is about 20019.2399705883. The cubic root of 400769969 is about 737.2787617149.

The spelling of 400769969 in words is "four hundred million, seven hundred sixty-nine thousand, nine hundred sixty-nine".