400372969 has 2 divisors, whose sum is σ = 400372970. Its totient is φ = 400372968.

The previous prime is 400372939. The next prime is 400372991. The reversal of 400372969 is 969273004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 387499225 + 12873744 = 19685^2 + 3588^2 .

It is a cyclic number.

It is not a de Polignac number, because 400372969 - 2¹⁵ = 400340201 is a prime.

It is a super-2 number, since 2×400372969² = 320597028611749922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400372939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200186484 + 200186485.

It is an arithmetic number, because the mean of its divisors is an integer number (200186485).

Almost surely, 2^400372969 is an apocalyptic number.

It is an amenable number.

400372969 is a deficient number, since it is larger than the sum of its proper divisors (1).

400372969 is an equidigital number, since it uses as much as digits as its factorization.

400372969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 400372969 is about 20009.3220524834. The cubic root of 400372969 is about 737.0352335125.

The spelling of 400372969 in words is "four hundred million, three hundred seventy-two thousand, nine hundred sixty-nine".