1218790 has 16 divisors (see below), whose sum is σ = 2206512. Its totient is φ = 484704.

The previous prime is 1218787. The next prime is 1218821. The reversal of 1218790 is 978121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2872 + ... + 3268.

It is an arithmetic number, because the mean of its divisors is an integer number (137907).

2^1218790 is an apocalyptic number.

1218790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1218790 is a deficient number, since it is larger than the sum of its proper divisors (987722).

1218790 is a wasteful number, since it uses less digits than its factorization.

1218790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 1218790 is about 1103.9882245749. The cubic root of 1218790 is about 106.8176356201.

It can be divided in two parts, 121 and 8790, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 1218790 in words is "one million, two hundred eighteen thousand, seven hundred ninety".