400123431 has 6 divisors (see below), whose sum is σ = 577956080. Its totient is φ = 266748948.

The previous prime is 400123429. The next prime is 400123459. The reversal of 400123431 is 134321004.

400123431 is a `hidden beast` number, since 400 + 1 + 234 + 31 = 666.

It is not a de Polignac number, because 400123431 - 2¹ = 400123429 is a prime.

It is a super-2 number, since 2×400123431² = 320197520070423522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400123331) 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 5 ways as a sum of consecutive naturals, for example, 22229071 + ... + 22229088.

Almost surely, 2^400123431 is an apocalyptic number.

400123431 is a deficient number, since it is larger than the sum of its proper divisors (177832649).

400123431 is a wasteful number, since it uses less digits than its factorization.

400123431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44458165 (or 44458162 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 400123431 is about 20003.0855369865. The cubic root of 400123431 is about 736.8820792160.

Adding to 400123431 its reverse (134321004), we get a palindrome (534444435).

The spelling of 400123431 in words is "four hundred million, one hundred twenty-three thousand, four hundred thirty-one".