3999644244 has 30 divisors (see below), whose sum is σ = 10455860954. Its totient is φ = 1333214640.

The previous prime is 3999644221. The next prime is 3999644249. The reversal of 3999644244 is 4424469993.

It is a happy number.

3999644244 is a `hidden beast` number, since 399 + 9 + 6 + 4 + 4 + 244 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3836315844 + 163328400 = 61938^2 + 12780^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999644249) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6171967 + ... + 6172614.

Almost surely, 2^3999644244 is an apocalyptic number.

It is an amenable number.

3999644244 is an abundant number, since it is smaller than the sum of its proper divisors (6456216710).

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

3999644244 is a wasteful number, since it uses less digits than its factorization.

3999644244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12344597 (or 12344586 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 54.

The square root of 3999644244 is about 63242.7406427014. The cubic root of 3999644244 is about 1587.3539899522.

The spelling of 3999644244 in words is "three billion, nine hundred ninety-nine million, six hundred forty-four thousand, two hundred forty-four".