218725 has 12 divisors (see below), whose sum is σ = 292516. Its totient is φ = 161280.

The previous prime is 218723. The next prime is 218737. The reversal of 218725 is 527812.

It can be written as a sum of positive squares in 6 ways, for example, as 37249 + 181476 = 193^2 + 426^2 .

It is not a de Polignac number, because 218725 - 2¹ = 218723 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 218725.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12 + ... + 661.

2²¹⁸⁷²⁵ is an apocalyptic number.

218725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

218725 is a deficient number, since it is larger than the sum of its proper divisors (73791).

218725 is a wasteful number, since it uses less digits than its factorization.

218725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696 (or 691 counting only the distinct ones).

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

The square root of 218725 is about 467.6804464589. The cubic root of 218725 is about 60.2512611433.

The spelling of 218725 in words is "two hundred eighteen thousand, seven hundred twenty-five".