3999515520 has 512 divisors, whose sum is σ = 17125032960. Its totient is φ = 766771200.

The previous prime is 3999515479. The next prime is 3999515537. The reversal of 3999515520 is 255159993.

It is a super-2 number, since 2×3999515520² = 31992248789441740800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 3999515520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1920880 + ... + 1922960.

It is an arithmetic number, because the mean of its divisors is an integer number (33447330).

Almost surely, 2^3999515520 is an apocalyptic number.

3999515520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3999515520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8562516480).

3999515520 is an abundant number, since it is smaller than the sum of its proper divisors (13125517440).

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

3999515520 is a wasteful number, since it uses less digits than its factorization.

3999515520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134 (or 2122 counting only the distinct ones).

The product of its (nonzero) digits is 546750, while the sum is 48.

The square root of 3999515520 is about 63241.7229366816. The cubic root of 3999515520 is about 1587.3369607087.

The spelling of 3999515520 in words is "three billion, nine hundred ninety-nine million, five hundred fifteen thousand, five hundred twenty".