725021 has 8 divisors (see below), whose sum is σ = 832800. Its totient is φ = 624240.

The previous prime is 725009. The next prime is 725041. The reversal of 725021 is 120527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 725021 - 2¹⁰ = 723997 is a prime.

It is a super-3 number, since 3×725021³ = 1143333721002552783, which contains 333 as substring.

It is a Duffinian number.

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 725021.

It is not an unprimeable number, because it can be changed into a prime (725041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1526 + ... + 1943.

It is an arithmetic number, because the mean of its divisors is an integer number (104100).

2⁷²⁵⁰²¹ is an apocalyptic number.

It is an amenable number.

725021 is a deficient number, since it is larger than the sum of its proper divisors (107779).

725021 is a wasteful number, since it uses less digits than its factorization.

725021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3499.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 725021 is about 851.4816498316. The cubic root of 725021 is about 89.8359563221.

Adding to 725021 its reverse (120527), we get a palindrome (845548).

The spelling of 725021 in words is "seven hundred twenty-five thousand, twenty-one".