1645490 has 32 divisors (see below), whose sum is σ = 3694464. Its totient is φ = 512640.

The previous prime is 1645487. The next prime is 1645499. The reversal of 1645490 is 945461.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1645499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299 + ... + 1838.

It is an arithmetic number, because the mean of its divisors is an integer number (115452).

2^1645490 is an apocalyptic number.

1645490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1645490 is an abundant number, since it is smaller than the sum of its proper divisors (2048974).

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

1645490 is a wasteful number, since it uses less digits than its factorization.

1645490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2162.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1645490 is about 1282.7665415032. The cubic root of 1645490 is about 118.0588139252.

Subtracting from 1645490 its sum of digits (29), we obtain a palindrome (1645461).

The spelling of 1645490 in words is "one million, six hundred forty-five thousand, four hundred ninety".