1869981918 has 32 divisors (see below), whose sum is σ = 4295960064. Its totient is φ = 531566112.

The previous prime is 1869981917. The next prime is 1869981977. The reversal of 1869981918 is 8191899681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1869981917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104730 + ... + 121277.

It is an arithmetic number, because the mean of its divisors is an integer number (134248752).

Almost surely, 2^1869981918 is an apocalyptic number.

1869981918 is an abundant number, since it is smaller than the sum of its proper divisors (2425978146).

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

1869981918 is a wasteful number, since it uses less digits than its factorization.

1869981918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226216.

The product of its digits is 2239488, while the sum is 60.

The square root of 1869981918 is about 43243.2875484739. The cubic root of 1869981918 is about 1232.0049961673.

The spelling of 1869981918 in words is "one billion, eight hundred sixty-nine million, nine hundred eighty-one thousand, nine hundred eighteen".