1666944 has 48 divisors (see below), whose sum is σ = 4800120. Its totient is φ = 555264.

The previous prime is 1666943. The next prime is 1666991. The reversal of 1666944 is 4496661.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a zygodrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 1666899 and 1666908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666943) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 429 + ... + 1875.

2^1666944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1666944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2400060).

1666944 is an abundant number, since it is smaller than the sum of its proper divisors (3133176).

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

1666944 is a wasteful number, since it uses less digits than its factorization.

1666944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1467 (or 1452 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 1666944 is about 1291.1018550060. The cubic root of 1666944 is about 118.5696860854.

The spelling of 1666944 in words is "one million, six hundred sixty-six thousand, nine hundred forty-four".