400633023 has 16 divisors (see below), whose sum is σ = 616418816. Its totient is φ = 226709280.

The previous prime is 400633001. The next prime is 400633027. The reversal of 400633023 is 320336004.

It is not a de Polignac number, because 400633023 - 2¹⁸ = 400370879 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400633027) 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, 90448 + ... + 94773.

It is an arithmetic number, because the mean of its divisors is an integer number (38526176).

Almost surely, 2^400633023 is an apocalyptic number.

400633023 is a deficient number, since it is larger than the sum of its proper divisors (215785793).

400633023 is a wasteful number, since it uses less digits than its factorization.

400633023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185334.

The product of its (nonzero) digits is 1296, while the sum is 21.

The square root of 400633023 is about 20015.8193187289. The cubic root of 400633023 is about 737.1947743175.

Adding to 400633023 its reverse (320336004), we get a palindrome (720969027).

The spelling of 400633023 in words is "four hundred million, six hundred thirty-three thousand, twenty-three".