3999744020 has 24 divisors (see below), whose sum is σ = 8893549224. Its totient is φ = 1505785856.

The previous prime is 3999744019. The next prime is 3999744097. The reversal of 3999744020 is 204479993.

It can be written as a sum of positive squares in 4 ways, for example, as 2174916496 + 1824827524 = 46636^2 + 42718^2 .

It is a congruent 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, 5881637 + ... + 5882316.

It is an arithmetic number, because the mean of its divisors is an integer number (370564551).

Almost surely, 2^3999744020 is an apocalyptic number.

It is an amenable number.

3999744020 is an abundant number, since it is smaller than the sum of its proper divisors (4893805204).

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

3999744020 is a wasteful number, since it uses less digits than its factorization.

3999744020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11763979 (or 11763977 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 3999744020 is about 63243.5294714013. The cubic root of 3999744020 is about 1587.3671893357.

The spelling of 3999744020 in words is "three billion, nine hundred ninety-nine million, seven hundred forty-four thousand, twenty".