19790000 has 50 divisors (see below), whose sum is σ = 47937780. Its totient is φ = 7912000.

The previous prime is 19789981. The next prime is 19790011. The reversal of 19790000 is 9791.

It is a tau number, because it is divible by the number of its divisors (50).

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 9 ways as a sum of consecutive naturals, for example, 9011 + ... + 10989.

Almost surely, 2^19790000 is an apocalyptic number.

19790000 is a gapful number since it is divisible by the number (10) 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 19790000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23968890).

19790000 is an abundant number, since it is smaller than the sum of its proper divisors (28147780).

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

19790000 is an equidigital number, since it uses as much as digits as its factorization.

19790000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2007 (or 1986 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 26.

The square root of 19790000 is about 4448.5952839070. The cubic root of 19790000 is about 270.4883707985.

Adding to 19790000 its reverse (9791), we get a palindrome (19799791).

The spelling of 19790000 in words is "nineteen million, seven hundred ninety thousand".