721725 has 12 divisors (see below), whose sum is σ = 1193376. Its totient is φ = 384880.

The previous prime is 721709. The next prime is 721733. The reversal of 721725 is 527127.

721725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 721725 - 2⁴ = 721709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 721695 and 721704.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721725.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4737 + ... + 4886.

It is an arithmetic number, because the mean of its divisors is an integer number (99448).

2⁷²¹⁷²⁵ is an apocalyptic number.

721725 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

721725 is a deficient number, since it is larger than the sum of its proper divisors (471651).

721725 is a wasteful number, since it uses less digits than its factorization.

721725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9636 (or 9631 counting only the distinct ones).

The product of its digits is 980, while the sum is 24.

The square root of 721725 is about 849.5439953293. The cubic root of 721725 is about 89.6996158366.

The spelling of 721725 in words is "seven hundred twenty-one thousand, seven hundred twenty-five".