721466 has 8 divisors (see below), whose sum is σ = 1088724. Its totient is φ = 358560.

The previous prime is 721451. The next prime is 721481. The reversal of 721466 is 664127.

It is an interprime number because it is at equal distance from previous prime (721451) and next prime (721481).

It can be written as a sum of positive squares in 2 ways, for example, as 687241 + 34225 = 829^2 + 185^2 .

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721466.

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, 635 + ... + 1358.

2⁷²¹⁴⁶⁶ is an apocalyptic number.

721466 is a deficient number, since it is larger than the sum of its proper divisors (367258).

721466 is a wasteful number, since it uses less digits than its factorization.

721466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2176.

The product of its digits is 2016, while the sum is 26.

The square root of 721466 is about 849.3915469323. The cubic root of 721466 is about 89.6888846116.

The spelling of 721466 in words is "seven hundred twenty-one thousand, four hundred sixty-six".