39440815812 has 84 divisors (see below), whose sum is σ = 103692013740. Its totient is φ = 13120615872.

The previous prime is 39440815781. The next prime is 39440815871. The reversal of 39440815812 is 21851804493.

39440815812 is a `hidden beast` number, since 3 + 94 + 408 + 158 + 1 + 2 = 666.

39440815812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 37289154816 + 2151660996 = 193104^2 + 46386^2 .

It is a super-2 number, since 2×39440815812² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1470958 + ... + 1497530.

It is an arithmetic number, because the mean of its divisors is an integer number (1234428735).

Almost surely, 2^39440815812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39440815812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51846006870).

39440815812 is an abundant number, since it is smaller than the sum of its proper divisors (64251197928).

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

39440815812 is a wasteful number, since it uses less digits than its factorization.

39440815812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27104 (or 27087 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 39440815812 in words is "thirty-nine billion, four hundred forty million, eight hundred fifteen thousand, eight hundred twelve".