1918701899 has 4 divisors (see below), whose sum is σ = 1919112360. Its totient is φ = 1918291440.

The previous prime is 1918701803. The next prime is 1918701907. The reversal of 1918701899 is 9981078191.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1918701899 - 2²⁰ = 1917653323 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1918701899.

It is not an unprimeable number, because it can be changed into a prime (1918707899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198137 + ... + 207594.

It is an arithmetic number, because the mean of its divisors is an integer number (479778090).

Almost surely, 2^1918701899 is an apocalyptic number.

1918701899 is a deficient number, since it is larger than the sum of its proper divisors (410461).

1918701899 is an equidigital number, since it uses as much as digits as its factorization.

1918701899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410460.

The product of its (nonzero) digits is 326592, while the sum is 53.

The square root of 1918701899 is about 43802.9896125824. The cubic root of 1918701899 is about 1242.6128349528.

The spelling of 1918701899 in words is "one billion, nine hundred eighteen million, seven hundred one thousand, eight hundred ninety-nine".