264389 has 4 divisors (see below), whose sum is σ = 265440. Its totient is φ = 263340.

The previous prime is 264371. The next prime is 264391. The reversal of 264389 is 983462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 983462 = 2 ⋅491731.

It is a cyclic number.

It is not a de Polignac number, because 264389 - 2⁸ = 264133 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 (264349) 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, 104 + ... + 734.

It is an arithmetic number, because the mean of its divisors is an integer number (66360).

2²⁶⁴³⁸⁹ is an apocalyptic number.

It is an amenable number.

264389 is a deficient number, since it is larger than the sum of its proper divisors (1051).

264389 is an equidigital number, since it uses as much as digits as its factorization.

264389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050.

The product of its digits is 10368, while the sum is 32.

The square root of 264389 is about 514.1877089157. The cubic root of 264389 is about 64.1821794918.

It can be divided in two parts, 2 and 64389, that multiplied together give a triangular number (128778 = T₅₀₇).

The spelling of 264389 in words is "two hundred sixty-four thousand, three hundred eighty-nine".