1660986 has 20 divisors (see below), whose sum is σ = 3722202. Its totient is φ = 553608.

The previous prime is 1660963. The next prime is 1661003. The reversal of 1660986 is 6890661.

It can be written as a sum of positive squares in only one way, i.e., 1610361 + 50625 = 1269^2 + 225^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1660986.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4965 + ... + 5288.

2^1660986 is an apocalyptic number.

1660986 is an abundant number, since it is smaller than the sum of its proper divisors (2061216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1660986 is a wasteful number, since it uses less digits than its factorization.

1660986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10267 (or 10258 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1660986 is about 1288.7924580785. The cubic root of 1660986 is about 118.4282533165.

The spelling of 1660986 in words is "one million, six hundred sixty thousand, nine hundred eighty-six".