40129711812 has 18 divisors (see below), whose sum is σ = 101438993838. Its totient is φ = 13376570592.

The previous prime is 40129711789. The next prime is 40129711847. The reversal of 40129711812 is 21811792104.

40129711812 is a `hidden beast` number, since 401 + 2 + 9 + 71 + 181 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 39630457476 + 499254336 = 199074^2 + 22344^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×40129711812² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1114714217 = 40129711812 / (4 + 0 + 1 + 2 + 9 + 7 + 1 + 1 + 8 + 1 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 557357073 + ... + 557357144.

Almost surely, 2^40129711812 is an apocalyptic number.

It is an amenable number.

40129711812 is an abundant number, since it is smaller than the sum of its proper divisors (61309282026).

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

40129711812 is a wasteful number, since it uses less digits than its factorization.

40129711812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114714227 (or 1114714222 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The spelling of 40129711812 in words is "forty billion, one hundred twenty-nine million, seven hundred eleven thousand, eight hundred twelve".