1866055 has 4 divisors (see below), whose sum is σ = 2239272. Its totient is φ = 1492840.

The previous prime is 1866049. The next prime is 1866083. The reversal of 1866055 is 5506681.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1866055 - 2⁹ = 1865543 is a prime.

It is a super-2 number, since 2×1866055² = 6964322526050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186601 + ... + 186610.

It is an arithmetic number, because the mean of its divisors is an integer number (559818).

2^1866055 is an apocalyptic number.

1866055 is a deficient number, since it is larger than the sum of its proper divisors (373217).

1866055 is an equidigital number, since it uses as much as digits as its factorization.

1866055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373216.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1866055 is about 1366.0362367082. The cubic root of 1866055 is about 123.1141997965.

It can be divided in two parts, 186 and 6055, that added together give a square (6241 = 79²).

The spelling of 1866055 in words is "one million, eight hundred sixty-six thousand, fifty-five".