3981528 has 32 divisors (see below), whose sum is σ = 11060400. Its totient is φ = 1327104.

The previous prime is 3981517. The next prime is 3981539. The reversal of 3981528 is 8251893.

It is an interprime number because it is at equal distance from previous prime (3981517) and next prime (3981539).

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 = 3981492 and 3981501.

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, 9001 + ... + 9432.

Almost surely, 2^3981528 is an apocalyptic number.

It is an amenable number.

3981528 is an abundant number, since it is smaller than the sum of its proper divisors (7078872).

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

3981528 is a wasteful number, since it uses less digits than its factorization.

3981528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18448 (or 18438 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 3981528 is about 1995.3766561730. The cubic root of 3981528 is about 158.4953741514.

The spelling of 3981528 in words is "three million, nine hundred eighty-one thousand, five hundred twenty-eight".