1866541 has 8 divisors (see below), whose sum is σ = 2028800. Its totient is φ = 1710720.

The previous prime is 1866521. The next prime is 1866547. The reversal of 1866541 is 1456681.

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

It is a cyclic number.

It is not a de Polignac number, because 1866541 - 2¹⁷ = 1735469 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866547) 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 7 ways as a sum of consecutive naturals, for example, 996 + ... + 2173.

It is an arithmetic number, because the mean of its divisors is an integer number (253600).

2^1866541 is an apocalyptic number.

It is an amenable number.

1866541 is a deficient number, since it is larger than the sum of its proper divisors (162259).

1866541 is a wasteful number, since it uses less digits than its factorization.

1866541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3219.

The product of its digits is 5760, while the sum is 31.

The square root of 1866541 is about 1366.2141120630. The cubic root of 1866541 is about 123.1248869248.

The spelling of 1866541 in words is "one million, eight hundred sixty-six thousand, five hundred forty-one".