18993801124 has 9 divisors (see below), whose sum is σ = 33239634337. Its totient is φ = 9496762744.

The previous prime is 18993801121. The next prime is 18993801131. The reversal of 18993801124 is 42110839981.

The square root of 18993801124 is 137818.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 13975495524 + 5018305600 = 118218^2 + 70840^2 .

It is a super-2 number, since 2×18993801124² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18993801121) 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 2 ways as a sum of consecutive naturals, for example, 241182 + ... + 310090.

Almost surely, 2^18993801124 is an apocalyptic number.

18993801124 is the 137818-th square number.

It is an amenable number.

18993801124 is a deficient number, since it is larger than the sum of its proper divisors (14245833213).

18993801124 is an frugal number, since it uses more digits than its factorization.

18993801124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137822 (or 68911 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 46.

The spelling of 18993801124 in words is "eighteen billion, nine hundred ninety-three million, eight hundred one thousand, one hundred twenty-four".