245987 has 4 divisors (see below), whose sum is σ = 281136. Its totient is φ = 210840.

The previous prime is 245983. The next prime is 245989. The reversal of 245987 is 789542.

It is a happy number.

245987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 245987 - 2² = 245983 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (245981) 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, 17564 + ... + 17577.

It is an arithmetic number, because the mean of its divisors is an integer number (70284).

2²⁴⁵⁹⁸⁷ is an apocalyptic number.

245987 is a deficient number, since it is larger than the sum of its proper divisors (35149).

245987 is an equidigital number, since it uses as much as digits as its factorization.

245987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35148.

The product of its digits is 20160, while the sum is 35.

The square root of 245987 is about 495.9707652675. The cubic root of 245987 is about 62.6571618048.

The spelling of 245987 in words is "two hundred forty-five thousand, nine hundred eighty-seven".