1266787 has 8 divisors (see below), whose sum is σ = 1356560. Its totient is φ = 1179360.

The previous prime is 1266781. The next prime is 1266799. The reversal of 1266787 is 7876621.

It is a happy number.

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 1266787 - 2³ = 1266779 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1266781) 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, 613 + ... + 1705.

It is an arithmetic number, because the mean of its divisors is an integer number (169570).

2^1266787 is an apocalyptic number.

1266787 is a deficient number, since it is larger than the sum of its proper divisors (89773).

1266787 is a wasteful number, since it uses less digits than its factorization.

1266787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173.

The product of its digits is 28224, while the sum is 37.

The square root of 1266787 is about 1125.5163259589. The cubic root of 1266787 is about 108.2018117260.

The spelling of 1266787 in words is "one million, two hundred sixty-six thousand, seven hundred eighty-seven".