1645045 has 4 divisors (see below), whose sum is σ = 1974060. Its totient is φ = 1316032.

The previous prime is 1645019. The next prime is 1645087. The reversal of 1645045 is 5405461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5405461 = 853 ⋅6337.

It can be written as a sum of positive squares in 2 ways, for example, as 544644 + 1100401 = 738^2 + 1049^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645045 - 2¹¹ = 1642997 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164500 + ... + 164509.

It is an arithmetic number, because the mean of its divisors is an integer number (493515).

2^1645045 is an apocalyptic number.

It is an amenable number.

1645045 is a deficient number, since it is larger than the sum of its proper divisors (329015).

1645045 is an equidigital number, since it uses as much as digits as its factorization.

1645045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329014.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 1645045 is about 1282.5930765445. The cubic root of 1645045 is about 118.0481705082.

The spelling of 1645045 in words is "one million, six hundred forty-five thousand, forty-five".