1993866 has 32 divisors (see below), whose sum is σ = 4717440. Its totient is φ = 549696.

The previous prime is 1993861. The next prime is 1993877. The reversal of 1993866 is 6683991.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1993861) 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 15 ways as a sum of consecutive naturals, for example, 400 + ... + 2036.

It is an arithmetic number, because the mean of its divisors is an integer number (147420).

2^1993866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1993866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2358720).

1993866 is an abundant number, since it is smaller than the sum of its proper divisors (2723574).

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

1993866 is a wasteful number, since it uses less digits than its factorization.

1993866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1678.

The product of its digits is 69984, while the sum is 42.

The square root of 1993866 is about 1412.0432004723. The cubic root of 1993866 is about 125.8631671534.

The spelling of 1993866 in words is "one million, nine hundred ninety-three thousand, eight hundred sixty-six".