1918399698 has 12 divisors (see below), whose sum is σ = 4156532718. Its totient is φ = 639466560.

The previous prime is 1918399687. The next prime is 1918399699. The reversal of 1918399698 is 8969938191.

It can be written as a sum of positive squares in only one way, i.e., 1213337889 + 705061809 = 34833^2 + 26553^2 .

It is not an unprimeable number, because it can be changed into a prime (1918399699) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53288863 + ... + 53288898.

Almost surely, 2^1918399698 is an apocalyptic number.

1918399698 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1918399698 is an abundant number, since it is smaller than the sum of its proper divisors (2238133020).

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

1918399698 is a wasteful number, since it uses less digits than its factorization.

1918399698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106577769 (or 106577766 counting only the distinct ones).

The product of its digits is 7558272, while the sum is 63.

The square root of 1918399698 is about 43799.5399290906. The cubic root of 1918399698 is about 1242.5475931769.

The spelling of 1918399698 in words is "one billion, nine hundred eighteen million, three hundred ninety-nine thousand, six hundred ninety-eight".