1645842 has 24 divisors (see below), whose sum is σ = 3619728. Its totient is φ = 498520.

The previous prime is 1645829. The next prime is 1645843. The reversal of 1645842 is 2485461.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1645843) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 408 + ... + 1859.

It is an arithmetic number, because the mean of its divisors is an integer number (150822).

2^1645842 is an apocalyptic number.

1645842 is an abundant number, since it is smaller than the sum of its proper divisors (1973886).

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

1645842 is a wasteful number, since it uses less digits than its factorization.

1645842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2294 (or 2283 counting only the distinct ones).

The product of its digits is 7680, while the sum is 30.

The square root of 1645842 is about 1282.9037376202. The cubic root of 1645842 is about 118.0672316284.

It can be divided in two parts, 164 and 5842, that added together give a palindrome (6006).

The spelling of 1645842 in words is "one million, six hundred forty-five thousand, eight hundred forty-two".