18843137 has 2 divisors, whose sum is σ = 18843138. Its totient is φ = 18843136.

The previous prime is 18843119. The next prime is 18843199. The reversal of 18843137 is 73134881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16982641 + 1860496 = 4121^2 + 1364^2 .

It is an emirp because it is prime and its reverse (73134881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18843137 - 2¹⁶ = 18777601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18843097 and 18843106.

It is not a weakly prime, because it can be changed into another prime (18843337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9421568 + 9421569.

It is an arithmetic number, because the mean of its divisors is an integer number (9421569).

Almost surely, 2^18843137 is an apocalyptic number.

It is an amenable number.

18843137 is a deficient number, since it is larger than the sum of its proper divisors (1).

18843137 is an equidigital number, since it uses as much as digits as its factorization.

18843137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 18843137 is about 4340.8682311261. The cubic root of 18843137 is about 266.1037952102.

The spelling of 18843137 in words is "eighteen million, eight hundred forty-three thousand, one hundred thirty-seven".