3991332 has 12 divisors (see below), whose sum is σ = 9313136. Its totient is φ = 1330440.

The previous prime is 3991331. The next prime is 3991333. The reversal of 3991332 is 2331993.

It is an interprime number because it is at equal distance from previous prime (3991331) and next prime (3991333).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×3991332² = 31861462268448, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3991332.

It is not an unprimeable number, because it can be changed into a prime (3991331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166294 + ... + 166317.

Almost surely, 2^3991332 is an apocalyptic number.

It is an amenable number.

3991332 is an abundant number, since it is smaller than the sum of its proper divisors (5321804).

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

3991332 is a wasteful number, since it uses less digits than its factorization.

3991332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332618 (or 332616 counting only the distinct ones).

The product of its digits is 4374, while the sum is 30.

The square root of 3991332 is about 1997.8318247540. The cubic root of 3991332 is about 158.6253590025.

The spelling of 3991332 in words is "three million, nine hundred ninety-one thousand, three hundred thirty-two".