264387 has 4 divisors (see below), whose sum is σ = 352520. Its totient is φ = 176256.

The previous prime is 264371. The next prime is 264391. The reversal of 264387 is 783462.

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

It is not a de Polignac number, because 264387 - 2⁴ = 264371 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264487) 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, 44062 + ... + 44067.

It is an arithmetic number, because the mean of its divisors is an integer number (88130).

2²⁶⁴³⁸⁷ is an apocalyptic number.

264387 is a deficient number, since it is larger than the sum of its proper divisors (88133).

264387 is an equidigital number, since it uses as much as digits as its factorization.

264387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88132.

The product of its digits is 8064, while the sum is 30.

The square root of 264387 is about 514.1857640970. The cubic root of 264387 is about 64.1820176536.

The spelling of 264387 in words is "two hundred sixty-four thousand, three hundred eighty-seven".