1660287 has 8 divisors (see below), whose sum is σ = 2219904. Its totient is φ = 1103768.

The previous prime is 1660283. The next prime is 1660289. The reversal of 1660287 is 7820661.

It is a happy number.

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 1660287 - 2² = 1660283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660283) 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, 1198 + ... + 2180.

It is an arithmetic number, because the mean of its divisors is an integer number (277488).

2^1660287 is an apocalyptic number.

1660287 is a deficient number, since it is larger than the sum of its proper divisors (559617).

1660287 is an equidigital number, since it uses as much as digits as its factorization.

1660287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 1660287 is about 1288.5212454593. The cubic root of 1660287 is about 118.4116380924.

The spelling of 1660287 in words is "one million, six hundred sixty thousand, two hundred eighty-seven".