721485 has 12 divisors (see below), whose sum is σ = 1250652. Its totient is φ = 384768.

The previous prime is 721481. The next prime is 721499. The reversal of 721485 is 584127.

It can be written as a sum of positive squares in 2 ways, for example, as 84681 + 636804 = 291^2 + 798^2 .

It is not a de Polignac number, because 721485 - 2² = 721481 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7972 + ... + 8061.

It is an arithmetic number, because the mean of its divisors is an integer number (104221).

2⁷²¹⁴⁸⁵ is an apocalyptic number.

It is an amenable number.

721485 is a deficient number, since it is larger than the sum of its proper divisors (529167).

721485 is a wasteful number, since it uses less digits than its factorization.

721485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16044 (or 16041 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 721485 is about 849.4027313354. The cubic root of 721485 is about 89.6896719316.

The spelling of 721485 in words is "seven hundred twenty-one thousand, four hundred eighty-five".