1218899 has 8 divisors (see below), whose sum is σ = 1375920. Its totient is φ = 1069600.

The previous prime is 1218859. The next prime is 1218901. The reversal of 1218899 is 9988121.

1218899 = T₁₂₂ + T₁₂₃ + ... + T₂₀₈.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1218899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218829) 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, 1592 + ... + 2229.

It is an arithmetic number, because the mean of its divisors is an integer number (171990).

2^1218899 is an apocalyptic number.

1218899 is a deficient number, since it is larger than the sum of its proper divisors (157021).

1218899 is a wasteful number, since it uses less digits than its factorization.

1218899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3861.

The product of its digits is 10368, while the sum is 38.

The square root of 1218899 is about 1104.0375899398. The cubic root of 1218899 is about 106.8208198643.

The spelling of 1218899 in words is "one million, two hundred eighteen thousand, eight hundred ninety-nine".