40129812 has 36 divisors (see below), whose sum is σ = 101797696. Its totient is φ = 13329360.

The previous prime is 40129811. The next prime is 40129819. The reversal of 40129812 is 21892104.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×40129812² = 3220803622310688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40129811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9237 + ... + 12867.

Almost surely, 2^40129812 is an apocalyptic number.

It is an amenable number.

40129812 is an abundant number, since it is smaller than the sum of its proper divisors (61667884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40129812 is a wasteful number, since it uses less digits than its factorization.

40129812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3948 (or 3943 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 40129812 is about 6334.8095472555. The cubic root of 40129812 is about 342.3647488420.

It can be divided in two parts, 4012 and 9812, that added together give a cube (13824 = 24³).

The spelling of 40129812 in words is "forty million, one hundred twenty-nine thousand, eight hundred twelve".