1918543604 has 12 divisors (see below), whose sum is σ = 3473225700. Its totient is φ = 926193408.

The previous prime is 1918543603. The next prime is 1918543657. The reversal of 1918543604 is 4063458191.

It can be written as a sum of positive squares in 2 ways, for example, as 1260108004 + 658435600 = 35498^2 + 25660^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918543603) 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, 8269469 + ... + 8269700.

It is an arithmetic number, because the mean of its divisors is an integer number (289435475).

Almost surely, 2^1918543604 is an apocalyptic number.

It is an amenable number.

1918543604 is a deficient number, since it is larger than the sum of its proper divisors (1554682096).

1918543604 is a wasteful number, since it uses less digits than its factorization.

1918543604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16539202 (or 16539200 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 1918543604 is about 43801.1826780967. The cubic root of 1918543604 is about 1242.5786617081.

The spelling of 1918543604 in words is "one billion, nine hundred eighteen million, five hundred forty-three thousand, six hundred four".