721227 has 8 divisors (see below), whose sum is σ = 1035664. Its totient is φ = 443808.

The previous prime is 721223. The next prime is 721229. The reversal of 721227 is 722127.

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

It is not a de Polignac number, because 721227 - 2² = 721223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721223) 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, 9208 + ... + 9285.

It is an arithmetic number, because the mean of its divisors is an integer number (129458).

2⁷²¹²²⁷ is an apocalyptic number.

721227 is a deficient number, since it is larger than the sum of its proper divisors (314437).

721227 is a wasteful number, since it uses less digits than its factorization.

721227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18509.

The product of its digits is 392, while the sum is 21.

The square root of 721227 is about 849.2508463346. The cubic root of 721227 is about 89.6789797739.

Subtracting 721227 from its reverse (722127), we obtain a square (900 = 30²).

The spelling of 721227 in words is "seven hundred twenty-one thousand, two hundred twenty-seven", and thus it is an iban number.