1866481 has 4 divisors (see below), whose sum is σ = 1976292. Its totient is φ = 1756672.

The previous prime is 1866467. The next prime is 1866499. The reversal of 1866481 is 1846681.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1600225 + 266256 = 1265^2 + 516^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1866481 is a prime.

It is a super-2 number, since 2×1866481² = 6967502646722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1866451) 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 3 ways as a sum of consecutive naturals, for example, 54880 + ... + 54913.

It is an arithmetic number, because the mean of its divisors is an integer number (494073).

2^1866481 is an apocalyptic number.

It is an amenable number.

1866481 is a deficient number, since it is larger than the sum of its proper divisors (109811).

1866481 is a wasteful number, since it uses less digits than its factorization.

1866481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109810.

The product of its digits is 9216, while the sum is 34.

The square root of 1866481 is about 1366.1921533957. The cubic root of 1866481 is about 123.1235676266.

The spelling of 1866481 in words is "one million, eight hundred sixty-six thousand, four hundred eighty-one".