18147893 has 2 divisors, whose sum is σ = 18147894. Its totient is φ = 18147892.

The previous prime is 18147887. The next prime is 18147917. The reversal of 18147893 is 39874181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13490929 + 4656964 = 3673^2 + 2158^2 .

It is a cyclic number.

It is not a de Polignac number, because 18147893 - 2²⁰ = 17099317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18147893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18147853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9073946 + 9073947.

It is an arithmetic number, because the mean of its divisors is an integer number (9073947).

Almost surely, 2^18147893 is an apocalyptic number.

It is an amenable number.

18147893 is a deficient number, since it is larger than the sum of its proper divisors (1).

18147893 is an equidigital number, since it uses as much as digits as its factorization.

18147893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 18147893 is about 4260.0343895326. The cubic root of 18147893 is about 262.7899405546.

The spelling of 18147893 in words is "eighteen million, one hundred forty-seven thousand, eight hundred ninety-three".