1645560 has 96 divisors (see below), whose sum is σ = 6121440. Its totient is φ = 375552.

The previous prime is 1645559. The next prime is 1645561. The reversal of 1645560 is 655461.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1645559) and next prime (1645561).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2194 + ... + 2846.

It is an arithmetic number, because the mean of its divisors is an integer number (63765).

2^1645560 is an apocalyptic number.

1645560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3060720).

1645560 is an abundant number, since it is smaller than the sum of its proper divisors (4475880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645560 is a wasteful number, since it uses less digits than its factorization.

1645560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 1645560 is about 1282.7938259908. The cubic root of 1645560 is about 118.0604879959.

Subtracting from 1645560 its reverse (655461), we obtain a palindrome (990099).

The spelling of 1645560 in words is "one million, six hundred forty-five thousand, five hundred sixty".