400689923 has 16 divisors (see below), whose sum is σ = 423346176. Its totient is φ = 378507360.

The previous prime is 400689901. The next prime is 400689929. The reversal of 400689923 is 329986004.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 400689923 - 2⁶ = 400689859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400689929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 865190 + ... + 865652.

It is an arithmetic number, because the mean of its divisors is an integer number (26459136).

Almost surely, 2^400689923 is an apocalyptic number.

400689923 is a deficient number, since it is larger than the sum of its proper divisors (22656253).

400689923 is a wasteful number, since it uses less digits than its factorization.

400689923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 400689923 is about 20017.2406440049. The cubic root of 400689923 is about 737.2296727529.

The spelling of 400689923 in words is "four hundred million, six hundred eighty-nine thousand, nine hundred twenty-three".