1645106 has 4 divisors (see below), whose sum is σ = 2467662. Its totient is φ = 822552.

The previous prime is 1645099. The next prime is 1645123. The reversal of 1645106 is 6015461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6015461 = 67 ⋅89783.

It can be written as a sum of positive squares in only one way, i.e., 1585081 + 60025 = 1259^2 + 245^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411275 + ... + 411278.

2^1645106 is an apocalyptic number.

1645106 is a deficient number, since it is larger than the sum of its proper divisors (822556).

1645106 is an equidigital number, since it uses as much as digits as its factorization.

1645106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822555.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1645106 is about 1282.6168562747. The cubic root of 1645106 is about 118.0496296069.

The spelling of 1645106 in words is "one million, six hundred forty-five thousand, one hundred six".