1229818 has 4 divisors (see below), whose sum is σ = 1844730. Its totient is φ = 614908.

The previous prime is 1229807. The next prime is 1229827. The reversal of 1229818 is 8189221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1075369 + 154449 = 1037^2 + 393^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1229818.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307453 + ... + 307456.

2^1229818 is an apocalyptic number.

1229818 is a deficient number, since it is larger than the sum of its proper divisors (614912).

1229818 is an equidigital number, since it uses as much as digits as its factorization.

1229818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614911.

The product of its digits is 2304, while the sum is 31.

The square root of 1229818 is about 1108.9715956687. The cubic root of 1229818 is about 107.1388420929.

The spelling of 1229818 in words is "one million, two hundred twenty-nine thousand, eight hundred eighteen".