1266999 has 8 divisors (see below), whose sum is σ = 1700352. Its totient is φ = 839160.

The previous prime is 1266953. The next prime is 1267009. The reversal of 1266999 is 9996621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1266999 - 2⁸ = 1266743 is a prime.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 1266999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266919) 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, 807 + ... + 1784.

It is an arithmetic number, because the mean of its divisors is an integer number (212544).

2^1266999 is an apocalyptic number.

1266999 is a deficient number, since it is larger than the sum of its proper divisors (433353).

1266999 is a wasteful number, since it uses less digits than its factorization.

1266999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2757.

The product of its digits is 52488, while the sum is 42.

The square root of 1266999 is about 1125.6105010171. The cubic root of 1266999 is about 108.2078473381.

The spelling of 1266999 in words is "one million, two hundred sixty-six thousand, nine hundred ninety-nine".