3126921 has 16 divisors (see below), whose sum is σ = 4844928. Its totient is φ = 1756800.

The previous prime is 3126901. The next prime is 3126961. The reversal of 3126921 is 1296213.

It is not a de Polignac number, because 3126921 - 2⁶ = 3126857 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3126891 and 3126900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3126901) 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 15 ways as a sum of consecutive naturals, for example, 61 + ... + 2501.

It is an arithmetic number, because the mean of its divisors is an integer number (302808).

Almost surely, 2^3126921 is an apocalyptic number.

It is an amenable number.

3126921 is a deficient number, since it is larger than the sum of its proper divisors (1718007).

3126921 is a wasteful number, since it uses less digits than its factorization.

3126921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512.

The product of its digits is 648, while the sum is 24.

The square root of 3126921 is about 1768.3102103421. The cubic root of 3126921 is about 146.2308383106.

The spelling of 3126921 in words is "three million, one hundred twenty-six thousand, nine hundred twenty-one".