18900393832 has 8 divisors (see below), whose sum is σ = 35438238450. Its totient is φ = 9450196912.

The previous prime is 18900393797. The next prime is 18900393839. The reversal of 18900393832 is 23839300981.

It can be written as a sum of positive squares in only one way, i.e., 14856196996 + 4044196836 = 121886^2 + 63594^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18900393839) 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 as a sum of consecutive naturals, namely, 1181274607 + ... + 1181274622.

Almost surely, 2^18900393832 is an apocalyptic number.

It is an amenable number.

18900393832 is a deficient number, since it is larger than the sum of its proper divisors (16537844618).

18900393832 is a wasteful number, since it uses less digits than its factorization.

18900393832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2362549235 (or 2362549231 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 18900393832 in words is "eighteen billion, nine hundred million, three hundred ninety-three thousand, eight hundred thirty-two".