725218 has 8 divisors (see below), whose sum is σ = 1171548. Its totient is φ = 334704.

The previous prime is 725209. The next prime is 725273. The reversal of 725218 is 812527.

It can be written as a sum of positive squares in 2 ways, for example, as 700569 + 24649 = 837^2 + 157^2 .

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

It is a super-2 number, since 2×725218² = 1051882295048, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 725192 and 725201.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13921 + ... + 13972.

2⁷²⁵²¹⁸ is an apocalyptic number.

725218 is a deficient number, since it is larger than the sum of its proper divisors (446330).

725218 is a wasteful number, since it uses less digits than its factorization.

725218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27908.

The product of its digits is 1120, while the sum is 25.

The square root of 725218 is about 851.5973226825. The cubic root of 725218 is about 89.8440922155.

The spelling of 725218 in words is "seven hundred twenty-five thousand, two hundred eighteen".