18943031383 has 4 divisors (see below), whose sum is σ = 19087634808. Its totient is φ = 18798427960.

The previous prime is 18943031323. The next prime is 18943031417. The reversal of 18943031383 is 38313034981.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18943031383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18943031323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72301516 + ... + 72301777.

It is an arithmetic number, because the mean of its divisors is an integer number (4771908702).

Almost surely, 2^18943031383 is an apocalyptic number.

18943031383 is a deficient number, since it is larger than the sum of its proper divisors (144603425).

18943031383 is a wasteful number, since it uses less digits than its factorization.

18943031383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144603424.

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 18943031383 in words is "eighteen billion, nine hundred forty-three million, thirty-one thousand, three hundred eighty-three".