1863966 has 32 divisors (see below), whose sum is σ = 4193280. Its totient is φ = 548064.

The previous prime is 1863941. The next prime is 1863971. The reversal of 1863966 is 6693681.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

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, 1275 + ... + 2313.

It is an arithmetic number, because the mean of its divisors is an integer number (131040).

2^1863966 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1863966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2096640).

1863966 is an abundant number, since it is smaller than the sum of its proper divisors (2329314).

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

1863966 is a wasteful number, since it uses less digits than its factorization.

1863966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080.

The product of its digits is 46656, while the sum is 39.

The square root of 1863966 is about 1365.2714015902. The cubic root of 1863966 is about 123.0682415952.

The spelling of 1863966 in words is "one million, eight hundred sixty-three thousand, nine hundred sixty-six".