721274 has 4 divisors (see below), whose sum is σ = 1081914. Its totient is φ = 360636.

The previous prime is 721267. The next prime is 721283. The reversal of 721274 is 472127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 573049 + 148225 = 757^2 + 385^2 .

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180317 + ... + 180320.

2⁷²¹²⁷⁴ is an apocalyptic number.

721274 is a deficient number, since it is larger than the sum of its proper divisors (360640).

721274 is a wasteful number, since it uses less digits than its factorization.

721274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360639.

The product of its digits is 784, while the sum is 23.

The square root of 721274 is about 849.2785173310. The cubic root of 721274 is about 89.6809277600.

The spelling of 721274 in words is "seven hundred twenty-one thousand, two hundred seventy-four", and thus it is an iban number.