4172721 has 8 divisors (see below), whose sum is σ = 6358464. Its totient is φ = 2384400.

The previous prime is 4172719. The next prime is 4172731. The reversal of 4172721 is 1272714.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4172721 - 2¹ = 4172719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4172691 and 4172700.

It is not an unprimeable number, because it can be changed into a prime (4172711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99330 + ... + 99371.

It is an arithmetic number, because the mean of its divisors is an integer number (794808).

Almost surely, 2^4172721 is an apocalyptic number.

It is an amenable number.

4172721 is a deficient number, since it is larger than the sum of its proper divisors (2185743).

4172721 is a wasteful number, since it uses less digits than its factorization.

4172721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198711.

The product of its digits is 784, while the sum is 24.

The square root of 4172721 is about 2042.7239167347. The cubic root of 4172721 is about 160.9927983096.

The spelling of 4172721 in words is "four million, one hundred seventy-two thousand, seven hundred twenty-one".