3990731 has 2 divisors, whose sum is σ = 3990732. Its totient is φ = 3990730.

The previous prime is 3990689. The next prime is 3990737. The reversal of 3990731 is 1370993.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3990731 is a prime.

It is a super-2 number, since 2×3990731² = 31851867828722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3990737) 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 as a sum of consecutive naturals, namely, 1995365 + 1995366.

It is an arithmetic number, because the mean of its divisors is an integer number (1995366).

Almost surely, 2^3990731 is an apocalyptic number.

3990731 is a deficient number, since it is larger than the sum of its proper divisors (1).

3990731 is an equidigital number, since it uses as much as digits as its factorization.

3990731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5103, while the sum is 32.

The square root of 3990731 is about 1997.6814060305. The cubic root of 3990731 is about 158.6173968631.

The spelling of 3990731 in words is "three million, nine hundred ninety thousand, seven hundred thirty-one".