1666734 has 8 divisors (see below), whose sum is σ = 3333480. Its totient is φ = 555576.

The previous prime is 1666733. The next prime is 1666757. The reversal of 1666734 is 4376661.

It is a sphenic number, since it is the product of 3 distinct primes.

1666734 is an admirable number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1666695 and 1666704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666733) 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, 138889 + ... + 138900.

It is an arithmetic number, because the mean of its divisors is an integer number (416685).

2^1666734 is an apocalyptic number.

1666734 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1666734 is a wasteful number, since it uses less digits than its factorization.

1666734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277794.

The product of its digits is 18144, while the sum is 33.

The square root of 1666734 is about 1291.0205265603. The cubic root of 1666734 is about 118.5647067781.

The spelling of 1666734 in words is "one million, six hundred sixty-six thousand, seven hundred thirty-four".