1218788 has 12 divisors (see below), whose sum is σ = 2173500. Its totient is φ = 597792.

The previous prime is 1218787. The next prime is 1218821. The reversal of 1218788 is 8878121.

It can be written as a sum of positive squares in 2 ways, for example, as 357604 + 861184 = 598^2 + 928^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1218787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2663 + ... + 3086.

It is an arithmetic number, because the mean of its divisors is an integer number (181125).

2^1218788 is an apocalyptic number.

It is an amenable number.

1218788 is a deficient number, since it is larger than the sum of its proper divisors (954712).

1218788 is a wasteful number, since it uses less digits than its factorization.

1218788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5806 (or 5804 counting only the distinct ones).

The product of its digits is 7168, while the sum is 35.

The square root of 1218788 is about 1103.9873187677. The cubic root of 1218788 is about 106.8175771918.

It can be divided in two parts, 12 and 18788, that multiplied together give a triangular number (225456 = T₆₇₁).

The spelling of 1218788 in words is "one million, two hundred eighteen thousand, seven hundred eighty-eight".