1665242 has 4 divisors (see below), whose sum is σ = 2497866. Its totient is φ = 832620.

The previous prime is 1665233. The next prime is 1665247. The reversal of 1665242 is 2425661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1661521 + 3721 = 1289^2 + 61^2 .

It is not an unprimeable number, because it can be changed into a prime (1665247) 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 as a sum of consecutive naturals, namely, 416309 + ... + 416312.

2^1665242 is an apocalyptic number.

1665242 is a deficient number, since it is larger than the sum of its proper divisors (832624).

1665242 is an equidigital number, since it uses as much as digits as its factorization.

1665242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832623.

The product of its digits is 2880, while the sum is 26.

The square root of 1665242 is about 1290.4425597445. The cubic root of 1665242 is about 118.5293179371.

The spelling of 1665242 in words is "one million, six hundred sixty-five thousand, two hundred forty-two".