1918899 has 12 divisors (see below), whose sum is σ = 2800512. Its totient is φ = 1266000.

The previous prime is 1918897. The next prime is 1918919. The reversal of 1918899 is 9988191.

It is not a de Polignac number, because 1918899 - 2¹ = 1918897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1918897) 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, 147 + ... + 1964.

It is an arithmetic number, because the mean of its divisors is an integer number (233376).

2^1918899 is an apocalyptic number.

1918899 is a deficient number, since it is larger than the sum of its proper divisors (881613).

1918899 is a wasteful number, since it uses less digits than its factorization.

1918899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2218 (or 2215 counting only the distinct ones).

The product of its digits is 46656, while the sum is 45.

The square root of 1918899 is about 1385.2432999297. The cubic root of 1918899 is about 124.2655383137.

The spelling of 1918899 in words is "one million, nine hundred eighteen thousand, eight hundred ninety-nine".