1918197827 has 12 divisors (see below), whose sum is σ = 2373832080. Its totient is φ = 1517694048.

The previous prime is 1918197823. The next prime is 1918197829. The reversal of 1918197827 is 7287918191.

It is not a de Polignac number, because 1918197827 - 2² = 1918197823 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1918197821) 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 11 ways as a sum of consecutive naturals, for example, 809552 + ... + 811917.

It is an arithmetic number, because the mean of its divisors is an integer number (197819340).

Almost surely, 2^1918197827 is an apocalyptic number.

1918197827 is a deficient number, since it is larger than the sum of its proper divisors (455634253).

1918197827 is a wasteful number, since it uses less digits than its factorization.

1918197827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621502 (or 1621489 counting only the distinct ones).

The product of its digits is 508032, while the sum is 53.

The square root of 1918197827 is about 43797.2353807863. The cubic root of 1918197827 is about 1242.5040076953.

The spelling of 1918197827 in words is "one billion, nine hundred eighteen million, one hundred ninety-seven thousand, eight hundred twenty-seven".