1645242 has 16 divisors (see below), whose sum is σ = 3379872. Its totient is φ = 533520.

The previous prime is 1645211. The next prime is 1645249. The reversal of 1645242 is 2425461.

It is not an unprimeable number, because it can be changed into a prime (1645249) 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 7 ways as a sum of consecutive naturals, for example, 3484 + ... + 3927.

It is an arithmetic number, because the mean of its divisors is an integer number (211242).

2^1645242 is an apocalyptic number.

1645242 is an abundant number, since it is smaller than the sum of its proper divisors (1734630).

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

1645242 is a wasteful number, since it uses less digits than its factorization.

1645242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7453.

The product of its digits is 1920, while the sum is 24.

The square root of 1645242 is about 1282.6698717909. The cubic root of 1645242 is about 118.0528825498.

The spelling of 1645242 in words is "one million, six hundred forty-five thousand, two hundred forty-two".