1918238305 has 16 divisors (see below), whose sum is σ = 2377603584. Its totient is φ = 1484173440.

The previous prime is 1918238297. The next prime is 1918238363. The reversal of 1918238305 is 5038328191.

It is not a de Polignac number, because 1918238305 - 2³ = 1918238297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361149 + ... + 366421.

It is an arithmetic number, because the mean of its divisors is an integer number (148600224).

Almost surely, 2^1918238305 is an apocalyptic number.

It is an amenable number.

1918238305 is a deficient number, since it is larger than the sum of its proper divisors (459365279).

1918238305 is a wasteful number, since it uses less digits than its factorization.

1918238305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7656.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 1918238305 is about 43797.6974851418. The cubic root of 1918238305 is about 1242.5127474479.

The spelling of 1918238305 in words is "one billion, nine hundred eighteen million, two hundred thirty-eight thousand, three hundred five".