1660873 has 2 divisors, whose sum is σ = 1660874. Its totient is φ = 1660872.

The previous prime is 1660871. The next prime is 1660889. The reversal of 1660873 is 3780661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1016064 + 644809 = 1008^2 + 803^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660873 - 2¹ = 1660871 is a prime.

Together with 1660871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1660871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830436 + 830437.

It is an arithmetic number, because the mean of its divisors is an integer number (830437).

2^1660873 is an apocalyptic number.

It is an amenable number.

1660873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660873 is an equidigital number, since it uses as much as digits as its factorization.

1660873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 1660873 is about 1288.7486178460. The cubic root of 1660873 is about 118.4255676234.

The spelling of 1660873 in words is "one million, six hundred sixty thousand, eight hundred seventy-three".