1866828 has 12 divisors (see below), whose sum is σ = 4355960. Its totient is φ = 622272.

The previous prime is 1866827. The next prime is 1866833. The reversal of 1866828 is 8286681.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1866827) 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 3 ways as a sum of consecutive naturals, for example, 77773 + ... + 77796.

2^1866828 is an apocalyptic number.

It is an amenable number.

1866828 is an abundant number, since it is smaller than the sum of its proper divisors (2489132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1866828 is a wasteful number, since it uses less digits than its factorization.

1866828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155576 (or 155574 counting only the distinct ones).

The product of its digits is 36864, while the sum is 39.

The square root of 1866828 is about 1366.3191428067. The cubic root of 1866828 is about 123.1311971766.

The spelling of 1866828 in words is "one million, eight hundred sixty-six thousand, eight hundred twenty-eight".