265987 has 2 divisors, whose sum is σ = 265988. Its totient is φ = 265986.

The previous prime is 265961. The next prime is 266003. The reversal of 265987 is 789562.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265987 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (265957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132993 + 132994.

It is an arithmetic number, because the mean of its divisors is an integer number (132994).

2²⁶⁵⁹⁸⁷ is an apocalyptic number.

265987 is a deficient number, since it is larger than the sum of its proper divisors (1).

265987 is an equidigital number, since it uses as much as digits as its factorization.

265987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 265987 is about 515.7392752157. The cubic root of 265987 is about 64.3112282030.

The spelling of 265987 in words is "two hundred sixty-five thousand, nine hundred eighty-seven".