1218429249 has 8 divisors (see below), whose sum is σ = 1626249312. Its totient is φ = 811447680.

The previous prime is 1218429241. The next prime is 1218429259. The reversal of 1218429249 is 9429248121.

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

It is not a de Polignac number, because 1218429249 - 2³ = 1218429241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1218429249.

It is not an unprimeable number, because it can be changed into a prime (1218429241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206224 + ... + 212049.

It is an arithmetic number, because the mean of its divisors is an integer number (203281164).

Almost surely, 2^1218429249 is an apocalyptic number.

It is an amenable number.

1218429249 is a deficient number, since it is larger than the sum of its proper divisors (407820063).

1218429249 is an equidigital number, since it uses as much as digits as its factorization.

1218429249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419247.

The product of its digits is 82944, while the sum is 42.

The square root of 1218429249 is about 34906.0059158879. The cubic root of 1218429249 is about 1068.0709555672.

The spelling of 1218429249 in words is "one billion, two hundred eighteen million, four hundred twenty-nine thousand, two hundred forty-nine".