19800126 has 48 divisors (see below), whose sum is σ = 44972928. Its totient is φ = 6528600.

The previous prime is 19800119. The next prime is 19800139. The reversal of 19800126 is 62100891.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 19800126.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 63511 + ... + 63821.

It is an arithmetic number, because the mean of its divisors is an integer number (936936).

Almost surely, 2^19800126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19800126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22486464).

19800126 is an abundant number, since it is smaller than the sum of its proper divisors (25172802).

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

19800126 is a wasteful number, since it uses less digits than its factorization.

19800126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459 (or 447 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 19800126 is about 4449.7332504320. The cubic root of 19800126 is about 270.5344967581.

The spelling of 19800126 in words is "nineteen million, eight hundred thousand, one hundred twenty-six".