721025 has 12 divisors (see below), whose sum is σ = 904704. Its totient is φ = 570000.

The previous prime is 721013. The next prime is 721037. The reversal of 721025 is 520127.

It is an interprime number because it is at equal distance from previous prime (721013) and next prime (721037).

It is not a de Polignac number, because 721025 - 2⁶ = 720961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 720994 and 721012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3680 + ... + 3870.

It is an arithmetic number, because the mean of its divisors is an integer number (75392).

2⁷²¹⁰²⁵ is an apocalyptic number.

It is an amenable number.

721025 is a deficient number, since it is larger than the sum of its proper divisors (183679).

721025 is a wasteful number, since it uses less digits than its factorization.

721025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352 (or 347 counting only the distinct ones).

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

The square root of 721025 is about 849.1319096583. The cubic root of 721025 is about 89.6706066148.

The spelling of 721025 in words is "seven hundred twenty-one thousand, twenty-five".