721459 has 4 divisors (see below), whose sum is σ = 731416. Its totient is φ = 711504.

The previous prime is 721451. The next prime is 721481. The reversal of 721459 is 954127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 954127 = 43 ⋅22189.

It is a cyclic number.

It is not a de Polignac number, because 721459 - 2³ = 721451 is a prime.

It is a Duffinian number.

721459 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (721451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4869 + ... + 5014.

It is an arithmetic number, because the mean of its divisors is an integer number (182854).

2⁷²¹⁴⁵⁹ is an apocalyptic number.

721459 is a deficient number, since it is larger than the sum of its proper divisors (9957).

721459 is an equidigital number, since it uses as much as digits as its factorization.

721459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9956.

The product of its digits is 2520, while the sum is 28.

The square root of 721459 is about 849.3874263256. The cubic root of 721459 is about 89.6885945428.

The spelling of 721459 in words is "seven hundred twenty-one thousand, four hundred fifty-nine".