1866081 has 8 divisors (see below), whose sum is σ = 2843584. Its totient is φ = 1066320.

The previous prime is 1866049. The next prime is 1866083. The reversal of 1866081 is 1806681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1866081 - 2⁵ = 1866049 is a prime.

It is a super-2 number, since 2×1866081² = 6964516597122, which contains 22 as substring.

It is a Duffinian 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44410 + ... + 44451.

It is an arithmetic number, because the mean of its divisors is an integer number (355448).

2^1866081 is an apocalyptic number.

It is an amenable number.

1866081 is a deficient number, since it is larger than the sum of its proper divisors (977503).

1866081 is an equidigital number, since it uses as much as digits as its factorization.

1866081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88871.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1866081 is about 1366.0457532601. The cubic root of 1866081 is about 123.1147715828.

The spelling of 1866081 in words is "one million, eight hundred sixty-six thousand, eighty-one".