245689 has 8 divisors (see below), whose sum is σ = 263840. Its totient is φ = 228096.

The previous prime is 245683. The next prime is 245711. The reversal of 245689 is 986542.

It is a happy number.

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 245689 - 2³ = 245681 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (245681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1177 + ... + 1369.

It is an arithmetic number, because the mean of its divisors is an integer number (32980).

2²⁴⁵⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

245689 is a deficient number, since it is larger than the sum of its proper divisors (18151).

245689 is a wasteful number, since it uses less digits than its factorization.

245689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279.

The product of its digits is 17280, while the sum is 34.

The square root of 245689 is about 495.6702532935. The cubic root of 245689 is about 62.6318496551.

It can be divided in two parts, 2 and 45689, that multiplied together give a triangular number (91378 = T₄₂₇).

The spelling of 245689 in words is "two hundred forty-five thousand, six hundred eighty-nine".