1918478899 has 8 divisors (see below), whose sum is σ = 1925264880. Its totient is φ = 1911705600.

The previous prime is 1918478893. The next prime is 1918478957. The reversal of 1918478899 is 9988748191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1918478899 - 2¹³ = 1918470707 is a prime.

It is a super-2 number, since 2×1918478899² = 7361122571816504402, which contains 22 as substring.

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 1918478899.

It is not an unprimeable number, because it can be changed into a prime (1918478893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375039 + ... + 380119.

It is an arithmetic number, because the mean of its divisors is an integer number (240658110).

Almost surely, 2^1918478899 is an apocalyptic number.

1918478899 is a deficient number, since it is larger than the sum of its proper divisors (6785981).

1918478899 is an equidigital number, since it uses as much as digits as its factorization.

1918478899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6341.

The product of its digits is 10450944, while the sum is 64.

The square root of 1918478899 is about 43800.4440502605. Note that the first 3 decimals coincide. The cubic root of 1918478899 is about 1242.5646924389.

The spelling of 1918478899 in words is "one billion, nine hundred eighteen million, four hundred seventy-eight thousand, eight hundred ninety-nine".