1866724 has 12 divisors (see below), whose sum is σ = 3355324. Its totient is φ = 908064.

The previous prime is 1866721. The next prime is 1866737. The reversal of 1866724 is 4276681.

It can be written as a sum of positive squares in 2 ways, for example, as 1276900 + 589824 = 1130^2 + 768^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1866724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866721) 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, 6159 + ... + 6454.

2^1866724 is an apocalyptic number.

It is an amenable number.

1866724 is a deficient number, since it is larger than the sum of its proper divisors (1488600).

1866724 is a wasteful number, since it uses less digits than its factorization.

1866724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12654 (or 12652 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 1866724 is about 1366.2810838184. The cubic root of 1866724 is about 123.1289106096.

The spelling of 1866724 in words is "one million, eight hundred sixty-six thousand, seven hundred twenty-four".