19870344 has 144 divisors (see below), whose sum is σ = 61663680. Its totient is φ = 5765760.

The previous prime is 19870309. The next prime is 19870351. The reversal of 19870344 is 44307891.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 19870299 and 19870308.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 279829 + ... + 279899.

It is an arithmetic number, because the mean of its divisors is an integer number (428220).

Almost surely, 2^19870344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19870344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30831840).

19870344 is an abundant number, since it is smaller than the sum of its proper divisors (41793336).

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

19870344 is a wasteful number, since it uses less digits than its factorization.

19870344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 19870344 is about 4457.6164034156. The cubic root of 19870344 is about 270.8539219904.

The spelling of 19870344 in words is "nineteen million, eight hundred seventy thousand, three hundred forty-four".