18137893 has 2 divisors, whose sum is σ = 18137894. Its totient is φ = 18137892.

The previous prime is 18137887. The next prime is 18137897. The reversal of 18137893 is 39873181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14577124 + 3560769 = 3818^2 + 1887^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18137893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18137897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9068946 + 9068947.

It is an arithmetic number, because the mean of its divisors is an integer number (9068947).

Almost surely, 2^18137893 is an apocalyptic number.

It is an amenable number.

18137893 is a deficient number, since it is larger than the sum of its proper divisors (1).

18137893 is an equidigital number, since it uses as much as digits as its factorization.

18137893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 18137893 is about 4258.8605283573. The cubic root of 18137893 is about 262.7416634675.

The spelling of 18137893 in words is "eighteen million, one hundred thirty-seven thousand, eight hundred ninety-three".