1861187 has 2 divisors, whose sum is σ = 1861188. Its totient is φ = 1861186.

The previous prime is 1861157. The next prime is 1861219. The reversal of 1861187 is 7811681.

It is an a-pointer prime, because the next prime (1861219) can be obtained adding 1861187 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1861187 - 2¹⁰ = 1860163 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1861157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930593 + 930594.

It is an arithmetic number, because the mean of its divisors is an integer number (930594).

2^1861187 is an apocalyptic number.

1861187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861187 is an equidigital number, since it uses as much as digits as its factorization.

1861187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 32.

The square root of 1861187 is about 1364.2532756054. The cubic root of 1861187 is about 123.0070500729.

It can be divided in two parts, 1861 and 187, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 1861187 in words is "one million, eight hundred sixty-one thousand, one hundred eighty-seven".