721475 has 6 divisors (see below), whose sum is σ = 894660. Its totient is φ = 577160.

The previous prime is 721451. The next prime is 721481. The reversal of 721475 is 574127.

It is not a de Polignac number, because 721475 - 2⁸ = 721219 is a prime.

It is a plaindrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721475.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14405 + ... + 14454.

It is an arithmetic number, because the mean of its divisors is an integer number (149110).

2⁷²¹⁴⁷⁵ is an apocalyptic number.

721475 is a deficient number, since it is larger than the sum of its proper divisors (173185).

721475 is a wasteful number, since it uses less digits than its factorization.

721475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28869 (or 28864 counting only the distinct ones).

The product of its digits is 1960, while the sum is 26.

The square root of 721475 is about 849.3968448258. The cubic root of 721475 is about 89.6892575544.

The spelling of 721475 in words is "seven hundred twenty-one thousand, four hundred seventy-five".