1866554 has 8 divisors (see below), whose sum is σ = 2852820. Its totient is φ = 915616.

The previous prime is 1866551. The next prime is 1866569. The reversal of 1866554 is 4556681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1760929 + 105625 = 1327^2 + 325^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1866551) 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, 8699 + ... + 8910.

2^1866554 is an apocalyptic number.

1866554 is a deficient number, since it is larger than the sum of its proper divisors (986266).

1866554 is a wasteful number, since it uses less digits than its factorization.

1866554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17664.

The product of its digits is 28800, while the sum is 35.

The square root of 1866554 is about 1366.2188697277. The cubic root of 1866554 is about 123.1251727690.

The spelling of 1866554 in words is "one million, eight hundred sixty-six thousand, five hundred fifty-four".