1909919018 has 16 divisors (see below), whose sum is σ = 3323016384. Its totient is φ = 806319360.

The previous prime is 1909918999. The next prime is 1909919029. The reversal of 1909919018 is 8109199091.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1017143 + ... + 1019018.

It is an arithmetic number, because the mean of its divisors is an integer number (207688524).

Almost surely, 2^1909919018 is an apocalyptic number.

1909919018 is a deficient number, since it is larger than the sum of its proper divisors (1413097366).

1909919018 is a wasteful number, since it uses less digits than its factorization.

1909919018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2036237.

The product of its (nonzero) digits is 52488, while the sum is 47.

The square root of 1909919018 is about 43702.6202646935. The cubic root of 1909919018 is about 1240.7139094857.

The spelling of 1909919018 in words is "one billion, nine hundred nine million, nine hundred nineteen thousand, eighteen".