1656245 has 4 divisors (see below), whose sum is σ = 1987500. Its totient is φ = 1324992.

The previous prime is 1656229. The next prime is 1656247. The reversal of 1656245 is 5426561.

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

It can be written as a sum of positive squares in 2 ways, for example, as 361201 + 1295044 = 601^2 + 1138^2 .

It is a cyclic number.

It is not a de Polignac number, because 1656245 - 2⁴ = 1656229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656247) 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 3 ways as a sum of consecutive naturals, for example, 165620 + ... + 165629.

It is an arithmetic number, because the mean of its divisors is an integer number (496875).

2^1656245 is an apocalyptic number.

It is an amenable number.

1656245 is a deficient number, since it is larger than the sum of its proper divisors (331255).

1656245 is an equidigital number, since it uses as much as digits as its factorization.

1656245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331254.

The product of its digits is 7200, while the sum is 29.

The square root of 1656245 is about 1286.9518250502. The cubic root of 1656245 is about 118.3154682193.

The spelling of 1656245 in words is "one million, six hundred fifty-six thousand, two hundred forty-five".