18732918340 has 24 divisors (see below), whose sum is σ = 39346899480. Its totient is φ = 7491687168.

The previous prime is 18732918319. The next prime is 18732918397. The reversal of 18732918340 is 4381923781.

It can be written as a sum of positive squares in 4 ways, for example, as 5871543876 + 12861374464 = 76626^2 + 113408^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14274 + ... + 194086.

It is an arithmetic number, because the mean of its divisors is an integer number (1639454145).

Almost surely, 2^18732918340 is an apocalyptic number.

18732918340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18732918340 is an abundant number, since it is smaller than the sum of its proper divisors (20613981140).

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

18732918340 is a wasteful number, since it uses less digits than its factorization.

18732918340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185031 (or 185029 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 18732918340 in words is "eighteen billion, seven hundred thirty-two million, nine hundred eighteen thousand, three hundred forty".