3121644 has 12 divisors (see below), whose sum is σ = 7283864. Its totient is φ = 1040544.

The previous prime is 3121633. The next prime is 3121663. The reversal of 3121644 is 4461213.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×3121644² = 19489322525472, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 3121644.

It is an unprimeable number.

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, 130057 + ... + 130080.

Almost surely, 2^3121644 is an apocalyptic number.

It is an amenable number.

3121644 is an abundant number, since it is smaller than the sum of its proper divisors (4162220).

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

3121644 is a wasteful number, since it uses less digits than its factorization.

3121644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260144 (or 260142 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 3121644 is about 1766.8174778397. The cubic root of 3121644 is about 146.1485321457.

Adding to 3121644 its reverse (4461213), we get a palindrome (7582857).

The spelling of 3121644 in words is "three million, one hundred twenty-one thousand, six hundred forty-four".