1266187 has 8 divisors (see below), whose sum is σ = 1373904. Its totient is φ = 1159968.

The previous prime is 1266163. The next prime is 1266191. The reversal of 1266187 is 7816621.

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

It is a cyclic number.

It is not a de Polignac number, because 1266187 - 2⁷ = 1266059 is a prime.

It is a Duffinian number.

1266187 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1266107) 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, 1968 + ... + 2530.

It is an arithmetic number, because the mean of its divisors is an integer number (171738).

2^1266187 is an apocalyptic number.

1266187 is the 563-rd decagonal number.

1266187 is a deficient number, since it is larger than the sum of its proper divisors (107717).

1266187 is a wasteful number, since it uses less digits than its factorization.

1266187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749.

The product of its digits is 4032, while the sum is 31.

The square root of 1266187 is about 1125.2497500555. The cubic root of 1266187 is about 108.1847261546.

The spelling of 1266187 in words is "one million, two hundred sixty-six thousand, one hundred eighty-seven".