1918744388 has 12 divisors (see below), whose sum is σ = 3663057552. Its totient is φ = 872156520.

The previous prime is 1918744381. The next prime is 1918744417. The reversal of 1918744388 is 8834478191.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1918744381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21803870 + ... + 21803957.

It is an arithmetic number, because the mean of its divisors is an integer number (305254796).

Almost surely, 2^1918744388 is an apocalyptic number.

It is an amenable number.

1918744388 is a deficient number, since it is larger than the sum of its proper divisors (1744313164).

1918744388 is a wasteful number, since it uses less digits than its factorization.

1918744388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43607842 (or 43607840 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 53.

The square root of 1918744388 is about 43803.4746110397. The cubic root of 1918744388 is about 1242.6220072978.

The spelling of 1918744388 in words is "one billion, nine hundred eighteen million, seven hundred forty-four thousand, three hundred eighty-eight".