400123231 has 8 divisors (see below), whose sum is σ = 414385664. Its totient is φ = 385945560.

The previous prime is 400123219. The next prime is 400123277. The reversal of 400123231 is 132321004.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400123231 - 2⁷ = 400123103 is a prime.

It is a super-2 number, since 2×400123231² = 320197199971758722, 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 (400123201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11505 + ... + 30538.

It is an arithmetic number, because the mean of its divisors is an integer number (51798208).

Almost surely, 2^400123231 is an apocalyptic number.

400123231 is a deficient number, since it is larger than the sum of its proper divisors (14262433).

400123231 is a wasteful number, since it uses less digits than its factorization.

400123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42381.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 400123231 is about 20003.0805377572. The cubic root of 400123231 is about 736.8819564402.

Adding to 400123231 its reverse (132321004), we get a palindrome (532444235).

The spelling of 400123231 in words is "four hundred million, one hundred twenty-three thousand, two hundred thirty-one".