3991662 has 24 divisors (see below), whose sum is σ = 8736624. Its totient is φ = 1317024.

The previous prime is 3991649. The next prime is 3991667. The reversal of 3991662 is 2661993.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 778 + ... + 2930.

It is an arithmetic number, because the mean of its divisors is an integer number (364026).

Almost surely, 2^3991662 is an apocalyptic number.

3991662 is an abundant number, since it is smaller than the sum of its proper divisors (4744962).

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

3991662 is a wasteful number, since it uses less digits than its factorization.

3991662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264 (or 2261 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 3991662 is about 1997.9144125813. The cubic root of 3991662 is about 158.6297305528.

The spelling of 3991662 in words is "three million, nine hundred ninety-one thousand, six hundred sixty-two".