1660249 has 6 divisors (see below), whose sum is σ = 1687466. Its totient is φ = 1633440.

The previous prime is 1660247. The next prime is 1660259. The reversal of 1660249 is 9420661.

1660249 is nontrivially palindromic in base 4.

It can be written as a sum of positive squares in only one way, i.e., 1550025 + 110224 = 1245^2 + 332^2 .

It is not a de Polignac number, because 1660249 - 2¹ = 1660247 is a prime.

It is a Duffinian number.

1660249 is a modest number, since divided by 249 gives 166 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1660247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6769 + ... + 7009.

2^1660249 is an apocalyptic number.

It is an amenable number.

1660249 is a deficient number, since it is larger than the sum of its proper divisors (27217).

1660249 is an frugal number, since it uses more digits than its factorization.

1660249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1660249 is about 1288.5064997896. The cubic root of 1660249 is about 118.4107346990.

The spelling of 1660249 in words is "one million, six hundred sixty thousand, two hundred forty-nine".