1866087 has 6 divisors (see below), whose sum is σ = 2695472. Its totient is φ = 1244052.

The previous prime is 1866083. The next prime is 1866091. The reversal of 1866087 is 7806681.

It is an interprime number because it is at equal distance from previous prime (1866083) and next prime (1866091).

It is not a de Polignac number, because 1866087 - 2² = 1866083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103663 + ... + 103680.

2^1866087 is an apocalyptic number.

1866087 is a deficient number, since it is larger than the sum of its proper divisors (829385).

1866087 is a wasteful number, since it uses less digits than its factorization.

1866087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207349 (or 207346 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1866087 is about 1366.0479493781. The cubic root of 1866087 is about 123.1149035328.

The spelling of 1866087 in words is "one million, eight hundred sixty-six thousand, eighty-seven".