1660687 has 8 divisors (see below), whose sum is σ = 1913472. Its totient is φ = 1411800.

The previous prime is 1660667. The next prime is 1660691. The reversal of 1660687 is 7860661.

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 1660687 - 2⁷ = 1660559 is a prime.

It is an Ulam number.

It is a Duffinian number.

1660687 is a lucky number.

It is a nialpdrome in base 6.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660667) 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, 12 + ... + 1822.

It is an arithmetic number, because the mean of its divisors is an integer number (239184).

2^1660687 is an apocalyptic number.

1660687 is a deficient number, since it is larger than the sum of its proper divisors (252785).

1660687 is a wasteful number, since it uses less digits than its factorization.

1660687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1949.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 1660687 is about 1288.6764527995. The cubic root of 1660687 is about 118.4211466597.

The spelling of 1660687 in words is "one million, six hundred sixty thousand, six hundred eighty-seven".