3156421 has 4 divisors (see below), whose sum is σ = 3160000. Its totient is φ = 3152844.

The previous prime is 3156409. The next prime is 3156427. The reversal of 3156421 is 1246513.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3156421 - 2¹¹ = 3154373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3156392 and 3156401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3156427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 580 + ... + 2578.

It is an arithmetic number, because the mean of its divisors is an integer number (790000).

Almost surely, 2^3156421 is an apocalyptic number.

It is an amenable number.

3156421 is a deficient number, since it is larger than the sum of its proper divisors (3579).

3156421 is a wasteful number, since it uses less digits than its factorization.

3156421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3578.

The product of its digits is 720, while the sum is 22.

The square root of 3156421 is about 1776.6319258642. The cubic root of 3156421 is about 146.6892567362.

The spelling of 3156421 in words is "three million, one hundred fifty-six thousand, four hundred twenty-one".