400123132 has 12 divisors (see below), whose sum is σ = 712083960. Its totient is φ = 196670576.

The previous prime is 400123123. The next prime is 400123193. The reversal of 400123132 is 231321004.

It is a happy number.

It is a super-2 number, since 2×400123132² = 320197041522978848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 847483 + ... + 847954.

It is an arithmetic number, because the mean of its divisors is an integer number (59340330).

Almost surely, 2^400123132 is an apocalyptic number.

It is an amenable number.

400123132 is a deficient number, since it is larger than the sum of its proper divisors (311960828).

400123132 is a wasteful number, since it uses less digits than its factorization.

400123132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695500 (or 1695498 counting only the distinct ones).

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

The square root of 400123132 is about 20003.0780631382. The cubic root of 400123132 is about 736.8818956661.

Adding to 400123132 its reverse (231321004), we get a palindrome (631444136).

The spelling of 400123132 in words is "four hundred million, one hundred twenty-three thousand, one hundred thirty-two".