400536769 has 2 divisors, whose sum is σ = 400536770. Its totient is φ = 400536768.

The previous prime is 400536761. The next prime is 400536793. The reversal of 400536769 is 967635004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 379743169 + 20793600 = 19487^2 + 4560^2 .

It is a cyclic number.

It is not a de Polignac number, because 400536769 - 2³ = 400536761 is a prime.

It is a super-2 number, since 2×400536769² = 320859406641918722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400536761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200268384 + 200268385.

It is an arithmetic number, because the mean of its divisors is an integer number (200268385).

Almost surely, 2^400536769 is an apocalyptic number.

It is an amenable number.

400536769 is a deficient number, since it is larger than the sum of its proper divisors (1).

400536769 is an equidigital number, since it uses as much as digits as its factorization.

400536769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 400536769 is about 20013.4147261281. The cubic root of 400536769 is about 737.1357313986.

The spelling of 400536769 in words is "four hundred million, five hundred thirty-six thousand, seven hundred sixty-nine".