1218288749 has 8 divisors (see below), whose sum is σ = 1230921120. Its totient is φ = 1205683056.

The previous prime is 1218288733. The next prime is 1218288769. The reversal of 1218288749 is 9478828121.

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

It is a cyclic number.

It is not a de Polignac number, because 1218288749 - 2⁴ = 1218288733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1218288697 and 1218288706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218288769) 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, 92702 + ... + 105024.

It is an arithmetic number, because the mean of its divisors is an integer number (153865140).

Almost surely, 2^1218288749 is an apocalyptic number.

It is an amenable number.

1218288749 is a deficient number, since it is larger than the sum of its proper divisors (12632371).

1218288749 is a wasteful number, since it uses less digits than its factorization.

1218288749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13339.

The product of its digits is 516096, while the sum is 50.

The square root of 1218288749 is about 34903.9933102217. The cubic root of 1218288749 is about 1068.0299000476.

The spelling of 1218288749 in words is "one billion, two hundred eighteen million, two hundred eighty-eight thousand, seven hundred forty-nine".