1639872 has 112 divisors (see below), whose sum is σ = 5262880. Its totient is φ = 497664.

The previous prime is 1639861. The next prime is 1639879. The reversal of 1639872 is 2789361.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1639879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22428 + ... + 22500.

It is an arithmetic number, because the mean of its divisors is an integer number (46990).

2^1639872 is an apocalyptic number.

1639872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1639872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2631440).

1639872 is an abundant number, since it is smaller than the sum of its proper divisors (3623008).

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

1639872 is a wasteful number, since it uses less digits than its factorization.

1639872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 91 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 1639872 is about 1280.5748709076. The cubic root of 1639872 is about 117.9243026904.

The spelling of 1639872 in words is "one million, six hundred thirty-nine thousand, eight hundred seventy-two".