3121690 has 64 divisors (see below), whose sum is σ = 6894720. Its totient is φ = 1002240.

The previous prime is 3121667. The next prime is 3121691. The reversal of 3121690 is 961213.

3121690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×3121690² = 19489896912200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (3121691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52881 + ... + 52939.

It is an arithmetic number, because the mean of its divisors is an integer number (107730).

Almost surely, 2^3121690 is an apocalyptic number.

3121690 is an abundant number, since it is smaller than the sum of its proper divisors (3773030).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3121690 is a wasteful number, since it uses less digits than its factorization.

3121690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 3121690 is about 1766.8304955485. The cubic root of 3121690 is about 146.1492500153.

It can be divided in two parts, 312 and 1690, that added together give a palindrome (2002).

The spelling of 3121690 in words is "three million, one hundred twenty-one thousand, six hundred ninety".