3091990 has 16 divisors (see below), whose sum is σ = 6071760. Its totient is φ = 1124320.

The previous prime is 3091987. The next prime is 3091997. The reversal of 3091990 is 991903.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3091997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13945 + ... + 14164.

It is an arithmetic number, because the mean of its divisors is an integer number (379485).

Almost surely, 2^3091990 is an apocalyptic number.

3091990 is a deficient number, since it is larger than the sum of its proper divisors (2979770).

3091990 is a wasteful number, since it uses less digits than its factorization.

3091990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28127.

The product of its (nonzero) digits is 2187, while the sum is 31.

The square root of 3091990 is about 1758.4055277438. The cubic root of 3091990 is about 145.6842805430.

Subtracting from 3091990 its product of nonzero digits (2187), we obtain a palindrome (3089803).

The spelling of 3091990 in words is "three million, ninety-one thousand, nine hundred ninety".