725815 has 8 divisors (see below), whose sum is σ = 922320. Its totient is φ = 546432.

The previous prime is 725807. The next prime is 725827. The reversal of 725815 is 518527.

725815 = 379² + 380² + ... + 383².

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 725815 - 2³ = 725807 is a prime.

725815 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4185 + ... + 4354.

It is an arithmetic number, because the mean of its divisors is an integer number (115290).

2⁷²⁵⁸¹⁵ is an apocalyptic number.

725815 is a deficient number, since it is larger than the sum of its proper divisors (196505).

725815 is a wasteful number, since it uses less digits than its factorization.

725815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8561.

The product of its digits is 2800, while the sum is 28.

The square root of 725815 is about 851.9477683520. The cubic root of 725815 is about 89.8687386950.

It can be divided in two parts, 725 and 815, that added together give a triangular number (1540 = T₅₅).

The spelling of 725815 in words is "seven hundred twenty-five thousand, eight hundred fifteen".