1666344 has 16 divisors (see below), whose sum is σ = 4165920. Its totient is φ = 555440.

The previous prime is 1666339. The next prime is 1666351. The reversal of 1666344 is 4436661.

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

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34692 + ... + 34739.

It is an arithmetic number, because the mean of its divisors is an integer number (260370).

2^1666344 is an apocalyptic number.

It is an amenable number.

1666344 is an abundant number, since it is smaller than the sum of its proper divisors (2499576).

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

1666344 is a wasteful number, since it uses less digits than its factorization.

1666344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69440 (or 69436 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 1666344 is about 1290.8694744241. The cubic root of 1666344 is about 118.5554583831. Note that the first 3 decimals are identical.

The spelling of 1666344 in words is "one million, six hundred sixty-six thousand, three hundred forty-four".