1644342 has 64 divisors (see below), whose sum is σ = 4147200. Its totient is φ = 432768.

The previous prime is 1644341. The next prime is 1644347. The reversal of 1644342 is 2434461.

It is a super-3 number, since 3×1644342³ = 13338214704127349064, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644341) 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 31 ways as a sum of consecutive naturals, for example, 34963 + ... + 35009.

It is an arithmetic number, because the mean of its divisors is an integer number (64800).

2^1644342 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1644342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2073600).

1644342 is an abundant number, since it is smaller than the sum of its proper divisors (2502858).

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

1644342 is a wasteful number, since it uses less digits than its factorization.

1644342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 76 counting only the distinct ones).

The product of its digits is 2304, while the sum is 24.

The square root of 1644342 is about 1282.3189930747. The cubic root of 1644342 is about 118.0313523891.

The spelling of 1644342 in words is "one million, six hundred forty-four thousand, three hundred forty-two".