3990531 has 4 divisors (see below), whose sum is σ = 5320712. Its totient is φ = 2660352.

The previous prime is 3990521. The next prime is 3990541. The reversal of 3990531 is 1350993.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (3990521) and next prime (3990541).

It is a de Polignac number, because none of the positive numbers 2^k-3990531 is a prime.

It is a super-2 number, since 2×3990531² = 31848675323922, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3990521) 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, 665086 + ... + 665091.

It is an arithmetic number, because the mean of its divisors is an integer number (1330178).

Almost surely, 2^3990531 is an apocalyptic number.

3990531 is a deficient number, since it is larger than the sum of its proper divisors (1330181).

3990531 is a wasteful number, since it uses less digits than its factorization.

3990531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330180.

The product of its (nonzero) digits is 3645, while the sum is 30.

The square root of 3990531 is about 1997.6313473712. The cubic root of 3990531 is about 158.6147470554.

The spelling of 3990531 in words is "three million, nine hundred ninety thousand, five hundred thirty-one".