1868189 has 2 divisors, whose sum is σ = 1868190. Its totient is φ = 1868188.

The previous prime is 1868183. The next prime is 1868201. The reversal of 1868189 is 9818681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1844164 + 24025 = 1358^2 + 155^2 .

It is a cyclic number.

It is not a de Polignac number, because 1868189 - 2⁴ = 1868173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1868183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934094 + 934095.

It is an arithmetic number, because the mean of its divisors is an integer number (934095).

2^1868189 is an apocalyptic number.

It is an amenable number.

1868189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868189 is an equidigital number, since it uses as much as digits as its factorization.

1868189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 41.

The square root of 1868189 is about 1366.8171055412. The cubic root of 1868189 is about 123.1611126002.

The spelling of 1868189 in words is "one million, eight hundred sixty-eight thousand, one hundred eighty-nine".