4172421 has 16 divisors (see below), whose sum is σ = 6174720. Its totient is φ = 2484720.

The previous prime is 4172417. The next prime is 4172431. The reversal of 4172421 is 1242714.

It is a happy number.

It is not a de Polignac number, because 4172421 - 2² = 4172417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4172431) 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, 876 + ... + 3018.

It is an arithmetic number, because the mean of its divisors is an integer number (385920).

Almost surely, 2^4172421 is an apocalyptic number.

It is an amenable number.

4172421 is a deficient number, since it is larger than the sum of its proper divisors (2002299).

4172421 is a wasteful number, since it uses less digits than its factorization.

4172421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216.

The product of its digits is 448, while the sum is 21.

The square root of 4172421 is about 2042.6504840525. The cubic root of 4172421 is about 160.9889399961.

The spelling of 4172421 in words is "four million, one hundred seventy-two thousand, four hundred twenty-one".