3991732 has 6 divisors (see below), whose sum is σ = 6985538. Its totient is φ = 1995864.

The previous prime is 3991727. The next prime is 3991747. The reversal of 3991732 is 2371993.

It can be written as a sum of positive squares in only one way, i.e., 3587236 + 404496 = 1894^2 + 636^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498963 + ... + 498970.

Almost surely, 2^3991732 is an apocalyptic number.

It is an amenable number.

3991732 is a deficient number, since it is larger than the sum of its proper divisors (2993806).

3991732 is a wasteful number, since it uses less digits than its factorization.

3991732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997937 (or 997935 counting only the distinct ones).

The product of its digits is 10206, while the sum is 34.

The square root of 3991732 is about 1997.9319307724. The cubic root of 3991732 is about 158.6306578204.

The spelling of 3991732 in words is "three million, nine hundred ninety-one thousand, seven hundred thirty-two".