3990528 has 66 divisors (see below), whose sum is σ = 11549174. Its totient is φ = 1327104.

The previous prime is 3990521. The next prime is 3990541. The reversal of 3990528 is 8250993.

It can be written as a sum of positive squares in only one way, i.e., 2663424 + 1327104 = 1632^2 + 1152^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 3990492 and 3990501.

It is not an unprimeable number, because it can be changed into a prime (3990521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9000 + ... + 9432.

Almost surely, 2^3990528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3990528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5774587).

3990528 is an abundant number, since it is smaller than the sum of its proper divisors (7558646).

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

3990528 is a wasteful number, since it uses less digits than its factorization.

3990528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 438 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 3990528 is about 1997.6305964817. The cubic root of 3990528 is about 158.6147073076.

The spelling of 3990528 in words is "three million, nine hundred ninety thousand, five hundred twenty-eight".