19871226 has 48 divisors (see below), whose sum is σ = 45864000. Its totient is φ = 6200064.

The previous prime is 19871219. The next prime is 19871227. The reversal of 19871226 is 62217891.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19871227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32875 + ... + 33473.

It is an arithmetic number, because the mean of its divisors is an integer number (955500).

Almost surely, 2^19871226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19871226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22932000).

19871226 is an abundant number, since it is smaller than the sum of its proper divisors (25992774).

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

19871226 is a wasteful number, since it uses less digits than its factorization.

19871226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723 (or 720 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 19871226 is about 4457.7153341146. The cubic root of 19871226 is about 270.8579294638.

The spelling of 19871226 in words is "nineteen million, eight hundred seventy-one thousand, two hundred twenty-six".