1218259730 has 16 divisors (see below), whose sum is σ = 2230035840. Its totient is φ = 479044272.

The previous prime is 1218259717. The next prime is 1218259739. The reversal of 1218259730 is 379528121.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1218259739) 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, 1031834 + ... + 1033013.

It is an arithmetic number, because the mean of its divisors is an integer number (139377240).

Almost surely, 2^1218259730 is an apocalyptic number.

1218259730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1218259730 is a deficient number, since it is larger than the sum of its proper divisors (1011776110).

1218259730 is a wasteful number, since it uses less digits than its factorization.

1218259730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2064913.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 1218259730 is about 34903.5776103253. The cubic root of 1218259730 is about 1068.0214200093.

The spelling of 1218259730 in words is "one billion, two hundred eighteen million, two hundred fifty-nine thousand, seven hundred thirty".