3999520 has 48 divisors (see below), whose sum is σ = 10801728. Its totient is φ = 1370880.

The previous prime is 3999517. The next prime is 3999529. The reversal of 3999520 is 259993.

It is a self number, because there is not a number n which added to its sum of digits gives 3999520.

It is not an unprimeable number, because it can be changed into a prime (3999529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666 + ... + 2905.

It is an arithmetic number, because the mean of its divisors is an integer number (225036).

Almost surely, 2^3999520 is an apocalyptic number.

It is an amenable number.

3999520 is an abundant number, since it is smaller than the sum of its proper divisors (6802208).

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

3999520 is a wasteful number, since it uses less digits than its factorization.

3999520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3593 (or 3585 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 37.

The square root of 3999520 is about 1999.8799963998. The cubic root of 3999520 is about 158.7337553386.

The spelling of 3999520 in words is "three million, nine hundred ninety-nine thousand, five hundred twenty".