1645345 has 16 divisors (see below), whose sum is σ = 2252880. Its totient is φ = 1142784.

The previous prime is 1645337. The next prime is 1645349. The reversal of 1645345 is 5435461.

It can be written as a sum of positive squares in 8 ways, for example, as 117649 + 1527696 = 343^2 + 1236^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645345 - 2³ = 1645337 is a prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361 + ... + 1849.

It is an arithmetic number, because the mean of its divisors is an integer number (140805).

2^1645345 is an apocalyptic number.

It is an amenable number.

1645345 is a deficient number, since it is larger than the sum of its proper divisors (607535).

1645345 is a wasteful number, since it uses less digits than its factorization.

1645345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524.

The product of its digits is 7200, while the sum is 28.

The square root of 1645345 is about 1282.7100217898. The cubic root of 1645345 is about 118.0553460563.

The spelling of 1645345 in words is "one million, six hundred forty-five thousand, three hundred forty-five".