1918434554 has 8 divisors (see below), whose sum is σ = 3002767200. Its totient is φ = 917512156.

The previous prime is 1918434521. The next prime is 1918434569. The reversal of 1918434554 is 4554348191.

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

It is a super-2 number, since 2×1918434554² = 7360782275962357832, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20852504 + ... + 20852595.

It is an arithmetic number, because the mean of its divisors is an integer number (375345900).

Almost surely, 2^1918434554 is an apocalyptic number.

1918434554 is a deficient number, since it is larger than the sum of its proper divisors (1084332646).

1918434554 is a wasteful number, since it uses less digits than its factorization.

1918434554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41705124.

The product of its digits is 345600, while the sum is 44.

The square root of 1918434554 is about 43799.9378310061. The cubic root of 1918434554 is about 1242.5551185423. Note that the first 3 decimals are identical.

The spelling of 1918434554 in words is "one billion, nine hundred eighteen million, four hundred thirty-four thousand, five hundred fifty-four".