1218880749 has 8 divisors (see below), whose sum is σ = 1629702720. Its totient is φ = 810322976.

The previous prime is 1218880703. The next prime is 1218880769. The reversal of 1218880749 is 9470888121.

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 1218880749 - 2¹¹ = 1218878701 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1218880698 and 1218880707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218880769) 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, 564792 + ... + 566945.

It is an arithmetic number, because the mean of its divisors is an integer number (203712840).

Almost surely, 2^1218880749 is an apocalyptic number.

It is an amenable number.

1218880749 is a deficient number, since it is larger than the sum of its proper divisors (410821971).

1218880749 is a wasteful number, since it uses less digits than its factorization.

1218880749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132099.

The product of its (nonzero) digits is 258048, while the sum is 48.

The square root of 1218880749 is about 34912.4726852740. The cubic root of 1218880749 is about 1068.2028670654.

The spelling of 1218880749 in words is "one billion, two hundred eighteen million, eight hundred eighty thousand, seven hundred forty-nine".