1865987 has 2 divisors, whose sum is σ = 1865988. Its totient is φ = 1865986.

The previous prime is 1865959. The next prime is 1865999. The reversal of 1865987 is 7895681.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (7895681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1865987 - 2¹⁶ = 1800451 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1865917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932993 + 932994.

It is an arithmetic number, because the mean of its divisors is an integer number (932994).

2^1865987 is an apocalyptic number.

1865987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1865987 is an equidigital number, since it uses as much as digits as its factorization.

1865987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 44.

The square root of 1865987 is about 1366.0113469514. The cubic root of 1865987 is about 123.1127043301.

The spelling of 1865987 in words is "one million, eight hundred sixty-five thousand, nine hundred eighty-seven".