1666733 has 2 divisors, whose sum is σ = 1666734. Its totient is φ = 1666732.

The previous prime is 1666729. The next prime is 1666757. The reversal of 1666733 is 3376661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1471369 + 195364 = 1213^2 + 442^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666733 - 2² = 1666729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1666733.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1666783) 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 as a sum of consecutive naturals, namely, 833366 + 833367.

It is an arithmetic number, because the mean of its divisors is an integer number (833367).

2^1666733 is an apocalyptic number.

It is an amenable number.

1666733 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666733 is an equidigital number, since it uses as much as digits as its factorization.

1666733 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 32.

The square root of 1666733 is about 1291.0201392697. The cubic root of 1666733 is about 118.5646830661.

The spelling of 1666733 in words is "one million, six hundred sixty-six thousand, seven hundred thirty-three".