3999870440 has 32 divisors (see below), whose sum is σ = 9053614080. Its totient is φ = 1590364992.

The previous prime is 3999870439. The next prime is 3999870451. The reversal of 3999870440 is 440789993.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292712 + ... + 306071.

It is an arithmetic number, because the mean of its divisors is an integer number (282925440).

Almost surely, 2^3999870440 is an apocalyptic number.

It is an amenable number.

3999870440 is an abundant number, since it is smaller than the sum of its proper divisors (5053743640).

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

3999870440 is a wasteful number, since it uses less digits than its factorization.

3999870440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 598961 (or 598957 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 53.

The square root of 3999870440 is about 63244.5289333394. The cubic root of 3999870440 is about 1587.3839131431.

The spelling of 3999870440 in words is "three billion, nine hundred ninety-nine million, eight hundred seventy thousand, four hundred forty".