3931990 has 16 divisors (see below), whose sum is σ = 7269552. Its totient is φ = 1530144.

The previous prime is 3931969. The next prime is 3931997. The reversal of 3931990 is 991393.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3931997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4944 + ... + 5683.

It is an arithmetic number, because the mean of its divisors is an integer number (454347).

Almost surely, 2^3931990 is an apocalyptic number.

3931990 is a deficient number, since it is larger than the sum of its proper divisors (3337562).

3931990 is a wasteful number, since it uses less digits than its factorization.

3931990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10671.

The product of its (nonzero) digits is 6561, while the sum is 34.

The square root of 3931990 is about 1982.9246077448. The cubic root of 3931990 is about 157.8352981147.

The spelling of 3931990 in words is "three million, nine hundred thirty-one thousand, nine hundred ninety".