3172421 has 16 divisors (see below), whose sum is σ = 3919104. Its totient is φ = 2505984.

The previous prime is 3172399. The next prime is 3172423. The reversal of 3172421 is 1242713.

It is a cyclic number.

It is not a de Polignac number, because 3172421 - 2⁶ = 3172357 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3172393 and 3172402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3172423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6056 + ... + 6558.

It is an arithmetic number, because the mean of its divisors is an integer number (244944).

Almost surely, 2^3172421 is an apocalyptic number.

It is an amenable number.

3172421 is a deficient number, since it is larger than the sum of its proper divisors (746683).

3172421 is a wasteful number, since it uses less digits than its factorization.

3172421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580.

The product of its digits is 336, while the sum is 20.

The square root of 3172421 is about 1781.1291362504. The cubic root of 3172421 is about 146.9366966392.

The spelling of 3172421 in words is "three million, one hundred seventy-two thousand, four hundred twenty-one".