1918308684 has 24 divisors (see below), whose sum is σ = 4485860848. Its totient is φ = 638035200.

The previous prime is 1918308683. The next prime is 1918308703. The reversal of 1918308684 is 4868038191.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1918308683) 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, 169417 + ... + 180384.

Almost surely, 2^1918308684 is an apocalyptic number.

It is an amenable number.

1918308684 is an abundant number, since it is smaller than the sum of its proper divisors (2567552164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1918308684 is a wasteful number, since it uses less digits than its factorization.

1918308684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350265 (or 350263 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 48.

The square root of 1918308684 is about 43798.5009332511. The cubic root of 1918308684 is about 1242.5279429418.

The spelling of 1918308684 in words is "one billion, nine hundred eighteen million, three hundred eight thousand, six hundred eighty-four".