3999519909 has 160 divisors (see below), whose sum is σ = 8018942976. Its totient is φ = 1922849280.

The previous prime is 3999519899. The next prime is 3999519911. The reversal of 3999519909 is 9099159993.

It is not a de Polignac number, because 3999519909 - 2⁷ = 3999519781 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999519919) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 7103662 + ... + 7104224.

Almost surely, 2^3999519909 is an apocalyptic number.

It is an amenable number.

3999519909 is an abundant number, since it is smaller than the sum of its proper divisors (4019423067).

3999519909 is a wasteful number, since it uses less digits than its factorization.

3999519909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 7971615, while the sum is 63.

The square root of 3999519909 is about 63241.7576368652. The cubic root of 3999519909 is about 1587.3375413474.

The spelling of 3999519909 in words is "three billion, nine hundred ninety-nine million, five hundred nineteen thousand, nine hundred nine".