400665269 has 2 divisors, whose sum is σ = 400665270. Its totient is φ = 400665268.

The previous prime is 400665253. The next prime is 400665281. The reversal of 400665269 is 962566004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 313467025 + 87198244 = 17705^2 + 9338^2 .

It is a cyclic number.

It is not a de Polignac number, because 400665269 - 2⁴ = 400665253 is a prime.

It is a super-2 number, since 2×400665269² = 321065315565684722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400665229) 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, 200332634 + 200332635.

It is an arithmetic number, because the mean of its divisors is an integer number (200332635).

Almost surely, 2^400665269 is an apocalyptic number.

It is an amenable number.

400665269 is a deficient number, since it is larger than the sum of its proper divisors (1).

400665269 is an equidigital number, since it uses as much as digits as its factorization.

400665269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 400665269 is about 20016.6248153878. The cubic root of 400665269 is about 737.2145521388.

The spelling of 400665269 in words is "four hundred million, six hundred sixty-five thousand, two hundred sixty-nine".