19638996 has 72 divisors (see below), whose sum is σ = 51381792. Its totient is φ = 5803200.

The previous prime is 19638979. The next prime is 19639001. The reversal of 19638996 is 69983691.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149851 + ... + 149981.

It is an arithmetic number, because the mean of its divisors is an integer number (713636).

Almost surely, 2^19638996 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 19638996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25690896).

19638996 is an abundant number, since it is smaller than the sum of its proper divisors (31742796).

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

19638996 is a wasteful number, since it uses less digits than its factorization.

19638996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 180 counting only the distinct ones).

The product of its digits is 629856, while the sum is 51.

The square root of 19638996 is about 4431.5906850701. The cubic root of 19638996 is about 269.7986427385.

It can be divided in two parts, 19 and 638996, that added together give a triangular number (639015 = T₁₁₃₀).

The spelling of 19638996 in words is "nineteen million, six hundred thirty-eight thousand, nine hundred ninety-six".