400423309 has 16 divisors (see below), whose sum is σ = 495190080. Its totient is φ = 318332160.

The previous prime is 400423301. The next prime is 400423313. The reversal of 400423309 is 903324004.

It is a cyclic number.

It is not a de Polignac number, because 400423309 - 2³ = 400423301 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400423301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70972 + ... + 76405.

It is an arithmetic number, because the mean of its divisors is an integer number (30949380).

Almost surely, 2^400423309 is an apocalyptic number.

It is an amenable number.

400423309 is a deficient number, since it is larger than the sum of its proper divisors (94766771).

400423309 is a wasteful number, since it uses less digits than its factorization.

400423309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147420.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 400423309 is about 20010.5799266288. The cubic root of 400423309 is about 737.0661220436.

The spelling of 400423309 in words is "four hundred million, four hundred twenty-three thousand, three hundred nine".