3996731 has 4 divisors (see below), whose sum is σ = 4002000. Its totient is φ = 3991464.

The previous prime is 3996653. The next prime is 3996743. The reversal of 3996731 is 1376993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1376993 = 53 ⋅25981.

It is a cyclic number.

It is not a de Polignac number, because 3996731 - 2¹⁸ = 3734587 is a prime.

It is a super-2 number, since 2×3996731² = 31947717372722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3996791) 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, 1256 + ... + 3093.

It is an arithmetic number, because the mean of its divisors is an integer number (1000500).

Almost surely, 2^3996731 is an apocalyptic number.

3996731 is a deficient number, since it is larger than the sum of its proper divisors (5269).

3996731 is an equidigital number, since it uses as much as digits as its factorization.

3996731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5268.

The product of its digits is 30618, while the sum is 38.

The square root of 3996731 is about 1999.1825829573. The cubic root of 3996731 is about 158.6968499609.

The spelling of 3996731 in words is "three million, nine hundred ninety-six thousand, seven hundred thirty-one".