3990637 has 4 divisors (see below), whose sum is σ = 4560736. Its totient is φ = 3420540.

The previous prime is 3990619. The next prime is 3990641. The reversal of 3990637 is 7360993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3990637 - 2⁷ = 3990509 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 3990596 and 3990605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3990607) 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 3 ways as a sum of consecutive naturals, for example, 285039 + ... + 285052.

It is an arithmetic number, because the mean of its divisors is an integer number (1140184).

Almost surely, 2^3990637 is an apocalyptic number.

It is an amenable number.

3990637 is a deficient number, since it is larger than the sum of its proper divisors (570099).

3990637 is an equidigital number, since it uses as much as digits as its factorization.

3990637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570098.

The product of its (nonzero) digits is 30618, while the sum is 37.

The square root of 3990637 is about 1997.6578786169. The cubic root of 3990637 is about 158.6161514645.

The spelling of 3990637 in words is "three million, nine hundred ninety thousand, six hundred thirty-seven".