1665243 has 6 divisors (see below), whose sum is σ = 2405364. Its totient is φ = 1110156.

The previous prime is 1665233. The next prime is 1665247. The reversal of 1665243 is 3425661.

1665243 is a `hidden beast` number, since 1 + 6 + 652 + 4 + 3 = 666.

It is not a de Polignac number, because 1665243 - 2⁵ = 1665211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1665247) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92505 + ... + 92522.

It is an arithmetic number, because the mean of its divisors is an integer number (400894).

2^1665243 is an apocalyptic number.

1665243 is a deficient number, since it is larger than the sum of its proper divisors (740121).

1665243 is a wasteful number, since it uses less digits than its factorization.

1665243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185033 (or 185030 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 1665243 is about 1290.4429472084. The cubic root of 1665243 is about 118.5293416633.

The spelling of 1665243 in words is "one million, six hundred sixty-five thousand, two hundred forty-three".