1645545 has 16 divisors (see below), whose sum is σ = 2872512. Its totient is φ = 797760.

The previous prime is 1645543. The next prime is 1645559. The reversal of 1645545 is 5455461.

It is not a de Polignac number, because 1645545 - 2¹ = 1645543 is a prime.

It is an Ulam number.

1645545 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1645543) 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, 4822 + ... + 5151.

It is an arithmetic number, because the mean of its divisors is an integer number (179532).

2^1645545 is an apocalyptic number.

1645545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1645545 is a deficient number, since it is larger than the sum of its proper divisors (1226967).

1645545 is a wasteful number, since it uses less digits than its factorization.

1645545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9992.

The product of its digits is 12000, while the sum is 30.

The square root of 1645545 is about 1282.7879793637. The cubic root of 1645545 is about 118.0601292705.

It can be divided in two parts, 1 and 645545, that added together give a palindrome (645546).

The spelling of 1645545 in words is "one million, six hundred forty-five thousand, five hundred forty-five".