400040012 has 12 divisors (see below), whose sum is σ = 730508016. Its totient is φ = 191323440.

The previous prime is 400039999. The next prime is 400040021. The reversal of 400040012 is 210040004.

It is a super-2 number, since 2×400040012² = 320064022401920288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 400039975 and 400040002.

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, 2174039 + ... + 2174222.

It is an arithmetic number, because the mean of its divisors is an integer number (60875668).

Almost surely, 2^400040012 is an apocalyptic number.

It is an amenable number.

400040012 is a deficient number, since it is larger than the sum of its proper divisors (330468004).

400040012 is a wasteful number, since it uses less digits than its factorization.

400040012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4348288 (or 4348286 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 400040012 is about 20001.0002749862. Note that the first 3 decimals coincide. The cubic root of 400040012 is about 736.8308664870.

Subtracting from 400040012 its sum of digits (11), we obtain a square (400040001 = 20001²).

Adding to 400040012 its reverse (210040004), we get a palindrome (610080016).

The spelling of 400040012 in words is "four hundred million, forty thousand, twelve".