264339809 has 4 divisors (see below), whose sum is σ = 264600240. Its totient is φ = 264079380.

The previous prime is 264339781. The next prime is 264339839. The reversal of 264339809 is 908933462.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-264339809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 264339809.

It is not an unprimeable number, because it can be changed into a prime (264339839) 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, 128687 + ... + 130724.

It is an arithmetic number, because the mean of its divisors is an integer number (66150060).

Almost surely, 2^264339809 is an apocalyptic number.

It is an amenable number.

264339809 is a deficient number, since it is larger than the sum of its proper divisors (260431).

264339809 is a wasteful number, since it uses less digits than its factorization.

264339809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260430.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 264339809 is about 16258.5303456370. The cubic root of 264339809 is about 641.7819876463.

The spelling of 264339809 in words is "two hundred sixty-four million, three hundred thirty-nine thousand, eight hundred nine".