266872139 has 4 divisors (see below), whose sum is σ = 267185856. Its totient is φ = 266558424.

The previous prime is 266872129. The next prime is 266872153. The reversal of 266872139 is 931278662.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266872139 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 266872139.

It is not an unprimeable number, because it can be changed into a prime (266872129) 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, 155579 + ... + 157284.

It is an arithmetic number, because the mean of its divisors is an integer number (66796464).

Almost surely, 2^266872139 is an apocalyptic number.

266872139 is a deficient number, since it is larger than the sum of its proper divisors (313717).

266872139 is an equidigital number, since it uses as much as digits as its factorization.

266872139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313716.

The product of its digits is 217728, while the sum is 44.

The square root of 266872139 is about 16336.2216867916. The cubic root of 266872139 is about 643.8248650922.

The spelling of 266872139 in words is "two hundred sixty-six million, eight hundred seventy-two thousand, one hundred thirty-nine".