1266813 has 8 divisors (see below), whose sum is σ = 1876800. Its totient is φ = 844524.

The previous prime is 1266799. The next prime is 1266841. The reversal of 1266813 is 3186621.

It is not a de Polignac number, because 1266813 - 2⁵ = 1266781 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: 46919 = 1266813 / (1 + 2 + 6 + 6 + 8 + 1 + 3).

It is a Curzon number.

1266813 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266883) 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, 23433 + ... + 23486.

It is an arithmetic number, because the mean of its divisors is an integer number (234600).

2^1266813 is an apocalyptic number.

It is an amenable number.

1266813 is a deficient number, since it is larger than the sum of its proper divisors (609987).

1266813 is an equidigital number, since it uses as much as digits as its factorization.

1266813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46928 (or 46922 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1266813 is about 1125.5278761541. The cubic root of 1266813 is about 108.2025519788.

The spelling of 1266813 in words is "one million, two hundred sixty-six thousand, eight hundred thirteen".