1218771 has 12 divisors (see below), whose sum is σ = 1772160. Its totient is φ = 807120.

The previous prime is 1218761. The next prime is 1218773. The reversal of 1218771 is 1778121.

It is not a de Polignac number, because 1218771 - 2⁵ = 1218739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1218773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1365 + ... + 2073.

It is an arithmetic number, because the mean of its divisors is an integer number (147680).

2^1218771 is an apocalyptic number.

1218771 is a deficient number, since it is larger than the sum of its proper divisors (553389).

1218771 is a wasteful number, since it uses less digits than its factorization.

1218771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 906 (or 903 counting only the distinct ones).

The product of its digits is 784, while the sum is 27.

The square root of 1218771 is about 1103.9796193771. The cubic root of 1218771 is about 106.8170805489.

The spelling of 1218771 in words is "one million, two hundred eighteen thousand, seven hundred seventy-one".