1868987 has 2 divisors, whose sum is σ = 1868988. Its totient is φ = 1868986.

The previous prime is 1868983. The next prime is 1868989. The reversal of 1868987 is 7898681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1868987 - 2² = 1868983 is a prime.

It is a super-2 number, since 2×1868987² = 6986224812338, which contains 22 as substring.

Together with 1868989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1868983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934493 + 934494.

It is an arithmetic number, because the mean of its divisors is an integer number (934494).

2^1868987 is an apocalyptic number.

1868987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868987 is an equidigital number, since it uses as much as digits as its factorization.

1868987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 47.

The square root of 1868987 is about 1367.1089934603. The cubic root of 1868987 is about 123.1786462611.

The spelling of 1868987 in words is "one million, eight hundred sixty-eight thousand, nine hundred eighty-seven".