400423169 has 4 divisors (see below), whose sum is σ = 417832896. Its totient is φ = 383013444.

The previous prime is 400423103. The next prime is 400423171. The reversal of 400423169 is 961324004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400423169 is a prime.

It is a super-2 number, since 2×400423169² = 320677428544005122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400423069) 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 in 3 ways as a sum of consecutive naturals, for example, 8704829 + ... + 8704874.

It is an arithmetic number, because the mean of its divisors is an integer number (104458224).

Almost surely, 2^400423169 is an apocalyptic number.

It is an amenable number.

400423169 is a deficient number, since it is larger than the sum of its proper divisors (17409727).

400423169 is a wasteful number, since it uses less digits than its factorization.

400423169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17409726.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 400423169 is about 20010.5764284790. The cubic root of 400423169 is about 737.0660361435.

The spelling of 400423169 in words is "four hundred million, four hundred twenty-three thousand, one hundred sixty-nine".