18937143 has 12 divisors (see below), whose sum is σ = 27421680. Its totient is φ = 12593376.

The previous prime is 18937141. The next prime is 18937147. The reversal of 18937143 is 34173981.

It is a happy number.

It is not a de Polignac number, because 18937143 - 2¹ = 18937141 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18937098 and 18937107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18937141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1555 + ... + 6347.

It is an arithmetic number, because the mean of its divisors is an integer number (2285140).

Almost surely, 2^18937143 is an apocalyptic number.

18937143 is a deficient number, since it is larger than the sum of its proper divisors (8484537).

18937143 is a wasteful number, since it uses less digits than its factorization.

18937143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5238 (or 5235 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 18937143 is about 4351.6827779607. The cubic root of 18937143 is about 266.5455806167.

The spelling of 18937143 in words is "eighteen million, nine hundred thirty-seven thousand, one hundred forty-three".