400654469 has 2 divisors, whose sum is σ = 400654470. Its totient is φ = 400654468.

The previous prime is 400654433. The next prime is 400654477. The reversal of 400654469 is 964456004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 301890625 + 98763844 = 17375^2 + 9938^2 .

It is a cyclic number.

It is not a de Polignac number, because 400654469 - 2⁸ = 400654213 is a prime.

It is a super-2 number, since 2×400654469² = 321048007059343922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400653469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200327234 + 200327235.

It is an arithmetic number, because the mean of its divisors is an integer number (200327235).

Almost surely, 2^400654469 is an apocalyptic number.

It is an amenable number.

400654469 is a deficient number, since it is larger than the sum of its proper divisors (1).

400654469 is an equidigital number, since it uses as much as digits as its factorization.

400654469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 400654469 is about 20016.3550378184. The cubic root of 400654469 is about 737.2079281650.

The spelling of 400654469 in words is "four hundred million, six hundred fifty-four thousand, four hundred sixty-nine".