1666534 has 8 divisors (see below), whose sum is σ = 2608560. Its totient is φ = 797016.

The previous prime is 1666531. The next prime is 1666541. The reversal of 1666534 is 4356661.

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

It is a junction number, because it is equal to n+sod(n) for n = 1666496 and 1666505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666531) 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, 18069 + ... + 18160.

It is an arithmetic number, because the mean of its divisors is an integer number (326070).

2^1666534 is an apocalyptic number.

1666534 is a deficient number, since it is larger than the sum of its proper divisors (942026).

1666534 is a wasteful number, since it uses less digits than its factorization.

1666534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36254.

The product of its digits is 12960, while the sum is 31.

The square root of 1666534 is about 1290.9430661342. The cubic root of 1666534 is about 118.5599641917.

The spelling of 1666534 in words is "one million, six hundred sixty-six thousand, five hundred thirty-four".