1646045 has 4 divisors (see below), whose sum is σ = 1975260. Its totient is φ = 1316832.

The previous prime is 1646033. The next prime is 1646101. The reversal of 1646045 is 5406461.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5406461 = 229 ⋅23609.

It can be written as a sum of positive squares in 2 ways, for example, as 1207801 + 438244 = 1099^2 + 662^2 .

It is a cyclic number.

It is not a de Polignac number, because 1646045 - 2¹⁸ = 1383901 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164600 + ... + 164609.

It is an arithmetic number, because the mean of its divisors is an integer number (493815).

2^1646045 is an apocalyptic number.

It is an amenable number.

1646045 is a deficient number, since it is larger than the sum of its proper divisors (329215).

1646045 is an equidigital number, since it uses as much as digits as its factorization.

1646045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329214.

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

The square root of 1646045 is about 1282.9828525744. The cubic root of 1646045 is about 118.0720856105.

The spelling of 1646045 in words is "one million, six hundred forty-six thousand, forty-five".