19819044 has 144 divisors (see below), whose sum is σ = 61501440. Its totient is φ = 5261760.

The previous prime is 19819039. The next prime is 19819057. The reversal of 19819044 is 44091891.

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

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 47 ways as a sum of consecutive naturals, for example, 335887 + ... + 335945.

Almost surely, 2^19819044 is an apocalyptic number.

19819044 is a gapful number since it is divisible by the number (14) 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 19819044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30750720).

19819044 is an abundant number, since it is smaller than the sum of its proper divisors (41682396).

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

19819044 is a wasteful number, since it uses less digits than its factorization.

19819044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 19819044 is about 4451.8584883170. The cubic root of 19819044 is about 270.6206299219.

It can be divided in two parts, 1981 and 9044, that added together give a square (11025 = 105²).

The spelling of 19819044 in words is "nineteen million, eight hundred nineteen thousand, forty-four".