225987 has 4 divisors (see below), whose sum is σ = 301320. Its totient is φ = 150656.

The previous prime is 225983. The next prime is 225989. The reversal of 225987 is 789522.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 225987 - 2² = 225983 is a prime.

It is a D-number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (225983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37662 + ... + 37667.

It is an arithmetic number, because the mean of its divisors is an integer number (75330).

2²²⁵⁹⁸⁷ is an apocalyptic number.

225987 is a deficient number, since it is larger than the sum of its proper divisors (75333).

225987 is an equidigital number, since it uses as much as digits as its factorization.

225987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75332.

The product of its digits is 10080, while the sum is 33.

The square root of 225987 is about 475.3808999108. The cubic root of 225987 is about 60.9108255377.

It can be divided in two parts, 2259 and 87, that added together give a triangular number (2346 = T₆₈).

The spelling of 225987 in words is "two hundred twenty-five thousand, nine hundred eighty-seven".