1666723 has 8 divisors (see below), whose sum is σ = 1729728. Its totient is φ = 1604904.

The previous prime is 1666711. The next prime is 1666727. The reversal of 1666723 is 3276661.

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

It is a cyclic number.

It is not a de Polignac number, because 1666723 - 2⁹ = 1666211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3336 + ... + 3802.

It is an arithmetic number, because the mean of its divisors is an integer number (216216).

2^1666723 is an apocalyptic number.

1666723 is a deficient number, since it is larger than the sum of its proper divisors (63005).

1666723 is an equidigital number, since it uses as much as digits as its factorization.

1666723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593.

The product of its digits is 9072, while the sum is 31.

The square root of 1666723 is about 1291.0162663576. The cubic root of 1666723 is about 118.5644459457.

It can be divided in two parts, 166 and 6723, that added together give a square (6889 = 83²).

The spelling of 1666723 in words is "one million, six hundred sixty-six thousand, seven hundred twenty-three".