1918374544 has 20 divisors (see below), whose sum is σ = 3722669100. Its totient is φ = 957685760.

The previous prime is 1918374541. The next prime is 1918374551. The reversal of 1918374544 is 4454738191.

It can be written as a sum of positive squares in 2 ways, for example, as 1075052944 + 843321600 = 32788^2 + 29040^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1918374494 and 1918374503.

It is not an unprimeable number, because it can be changed into a prime (1918374541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83269 + ... + 103780.

It is an arithmetic number, because the mean of its divisors is an integer number (186133455).

Almost surely, 2^1918374544 is an apocalyptic number.

It is an amenable number.

1918374544 is a deficient number, since it is larger than the sum of its proper divisors (1804294556).

1918374544 is a wasteful number, since it uses less digits than its factorization.

1918374544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187698 (or 187692 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

The square root of 1918374544 is about 43799.2527790144. The cubic root of 1918374544 is about 1242.5421624041.

The spelling of 1918374544 in words is "one billion, nine hundred eighteen million, three hundred seventy-four thousand, five hundred forty-four".