264989 has 4 divisors (see below), whose sum is σ = 266556. Its totient is φ = 263424.

The previous prime is 264977. The next prime is 264991. The reversal of 264989 is 989462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 989462 = 2 ⋅494731.

It can be written as a sum of positive squares in 2 ways, for example, as 184900 + 80089 = 430^2 + 283^2 .

It is a cyclic number.

It is not a de Polignac number, because 264989 - 2¹² = 260893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264919) 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, 494 + ... + 879.

It is an arithmetic number, because the mean of its divisors is an integer number (66639).

2²⁶⁴⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

264989 is a deficient number, since it is larger than the sum of its proper divisors (1567).

264989 is a wasteful number, since it uses less digits than its factorization.

264989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566.

The product of its digits is 31104, while the sum is 38.

The square root of 264989 is about 514.7708227940. The cubic root of 264989 is about 64.2306941344.

The spelling of 264989 in words is "two hundred sixty-four thousand, nine hundred eighty-nine".