3990624 has 48 divisors (see below), whose sum is σ = 11430720. Its totient is φ = 1208960.

The previous prime is 3990619. The next prime is 3990641. The reversal of 3990624 is 4260993.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a nialpdrome in base 13.

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, 834 + ... + 2945.

It is an arithmetic number, because the mean of its divisors is an integer number (238140).

Almost surely, 2^3990624 is an apocalyptic number.

It is an amenable number.

3990624 is an abundant number, since it is smaller than the sum of its proper divisors (7440096).

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

3990624 is a wasteful number, since it uses less digits than its factorization.

3990624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3803 (or 3795 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 3990624 is about 1997.6546248038. The cubic root of 3990624 is about 158.6159792270.

The spelling of 3990624 in words is "three million, nine hundred ninety thousand, six hundred twenty-four".