1660042 has 8 divisors (see below), whose sum is σ = 2557476. Its totient is φ = 807552.

The previous prime is 1660039. The next prime is 1660063. The reversal of 1660042 is 2400661.

It can be written as a sum of positive squares in 2 ways, for example, as 1324801 + 335241 = 1151^2 + 579^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11143 + ... + 11290.

2^1660042 is an apocalyptic number.

1660042 is a deficient number, since it is larger than the sum of its proper divisors (897434).

1660042 is a wasteful number, since it uses less digits than its factorization.

1660042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22472.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1660042 is about 1288.4261717305. The cubic root of 1660042 is about 118.4058133407.

The spelling of 1660042 in words is "one million, six hundred sixty thousand, forty-two".