721495 has 4 divisors (see below), whose sum is σ = 865800. Its totient is φ = 577192.

The previous prime is 721481. The next prime is 721499. The reversal of 721495 is 594127.

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: 594127 = 47 ⋅12641.

It is a cyclic number.

It is not a de Polignac number, because 721495 - 2⁹ = 720983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721499) 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, 72145 + ... + 72154.

It is an arithmetic number, because the mean of its divisors is an integer number (216450).

2⁷²¹⁴⁹⁵ is an apocalyptic number.

721495 is a deficient number, since it is larger than the sum of its proper divisors (144305).

721495 is a wasteful number, since it uses less digits than its factorization.

721495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144304.

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

The square root of 721495 is about 849.4086178042. The cubic root of 721495 is about 89.6900863050.

The spelling of 721495 in words is "seven hundred twenty-one thousand, four hundred ninety-five".