1918243686 has 32 divisors (see below), whose sum is σ = 4177670400. Its totient is φ = 584871840.

The previous prime is 1918243669. The next prime is 1918243693. The reversal of 1918243686 is 6863428191.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286810 + ... + 293421.

It is an arithmetic number, because the mean of its divisors is an integer number (130552200).

Almost surely, 2^1918243686 is an apocalyptic number.

1918243686 is an abundant number, since it is smaller than the sum of its proper divisors (2259426714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1918243686 is a wasteful number, since it uses less digits than its factorization.

1918243686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580284.

The product of its digits is 497664, while the sum is 48.

The square root of 1918243686 is about 43797.7589152687. The cubic root of 1918243686 is about 1242.5139092700.

The spelling of 1918243686 in words is "one billion, nine hundred eighteen million, two hundred forty-three thousand, six hundred eighty-six".