18436437143 has 24 divisors (see below), whose sum is σ = 19711739088. Its totient is φ = 17239557888.

The previous prime is 18436437127. The next prime is 18436437161. The reversal of 18436437143 is 34173463481.

It is a happy number.

It is not a de Polignac number, because 18436437143 - 2⁴ = 18436437127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18436437094 and 18436437103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18436437113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11543621 + ... + 11545217.

It is an arithmetic number, because the mean of its divisors is an integer number (821322462).

Almost surely, 2^18436437143 is an apocalyptic number.

18436437143 is a deficient number, since it is larger than the sum of its proper divisors (1275301945).

18436437143 is a wasteful number, since it uses less digits than its factorization.

18436437143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2031 (or 2012 counting only the distinct ones).

The product of its digits is 580608, while the sum is 44.

The spelling of 18436437143 in words is "eighteen billion, four hundred thirty-six million, four hundred thirty-seven thousand, one hundred forty-three".