1866801 has 8 divisors (see below), whose sum is σ = 2497600. Its totient is φ = 1240272.

The previous prime is 1866779. The next prime is 1866827. The reversal of 1866801 is 1086681.

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

It is not a de Polignac number, because 1866801 - 2⁶ = 1866737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1866871) 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, 156 + ... + 1938.

It is an arithmetic number, because the mean of its divisors is an integer number (312200).

2^1866801 is an apocalyptic number.

It is an amenable number.

1866801 is a deficient number, since it is larger than the sum of its proper divisors (630799).

1866801 is a wasteful number, since it uses less digits than its factorization.

1866801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135.

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

The square root of 1866801 is about 1366.3092622097. The cubic root of 1866801 is about 123.1306035568.

It can be divided in two parts, 186680 and 1, that added together give a palindrome (186681).

The spelling of 1866801 in words is "one million, eight hundred sixty-six thousand, eight hundred one".