266139 has 8 divisors (see below), whose sum is σ = 394320. Its totient is φ = 177408.

The previous prime is 266137. The next prime is 266153. The reversal of 266139 is 931662.

It is a happy number.

It is not a de Polignac number, because 266139 - 2¹ = 266137 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 9857 = 266139 / (2 + 6 + 6 + 1 + 3 + 9).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 266139.

It is not an unprimeable number, because it can be changed into a prime (266137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4902 + ... + 4955.

It is an arithmetic number, because the mean of its divisors is an integer number (49290).

2²⁶⁶¹³⁹ is an apocalyptic number.

266139 is a deficient number, since it is larger than the sum of its proper divisors (128181).

266139 is an equidigital number, since it uses as much as digits as its factorization.

266139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9866 (or 9860 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 266139 is about 515.8866154496. The cubic root of 266139 is about 64.3234762267.

The spelling of 266139 in words is "two hundred sixty-six thousand, one hundred thirty-nine".