19887426 has 48 divisors (see below), whose sum is σ = 47678904. Its totient is φ = 5951232.

The previous prime is 19887421. The next prime is 19887449. The reversal of 19887426 is 62478891.

It can be written as a sum of positive squares in 4 ways, for example, as 17214201 + 2673225 = 4149^2 + 1635^2 .

It is not an unprimeable number, because it can be changed into a prime (19887421) by changing a digit.

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, 7510 + ... + 9806.

Almost surely, 2^19887426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19887426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23839452).

19887426 is an abundant number, since it is smaller than the sum of its proper divisors (27791478).

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

19887426 is a wasteful number, since it uses less digits than its factorization.

19887426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355 (or 2352 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 19887426 is about 4459.5320382300. The cubic root of 19887426 is about 270.9315150356.

The spelling of 19887426 in words is "nineteen million, eight hundred eighty-seven thousand, four hundred twenty-six".