721774 has 8 divisors (see below), whose sum is σ = 1089648. Its totient is φ = 358560.

The previous prime is 721739. The next prime is 721783. The reversal of 721774 is 477127.

721774 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 747 + ... + 1414.

It is an arithmetic number, because the mean of its divisors is an integer number (136206).

2⁷²¹⁷⁷⁴ is an apocalyptic number.

721774 is a deficient number, since it is larger than the sum of its proper divisors (367874).

721774 is a wasteful number, since it uses less digits than its factorization.

721774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330.

The product of its digits is 2744, while the sum is 28.

The square root of 721774 is about 849.5728338406. The cubic root of 721774 is about 89.7016457795.

The spelling of 721774 in words is "seven hundred twenty-one thousand, seven hundred seventy-four", and thus it is an iban number.