19949019426 has 96 divisors (see below), whose sum is σ = 49974312960. Its totient is φ = 5633566848.

The previous prime is 19949019403. The next prime is 19949019457. The reversal of 19949019426 is 62491094991.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3894495 + ... + 3899613.

It is an arithmetic number, because the mean of its divisors is an integer number (520565760).

Almost surely, 2^19949019426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19949019426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24987156480).

19949019426 is an abundant number, since it is smaller than the sum of its proper divisors (30025293534).

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

19949019426 is a wasteful number, since it uses less digits than its factorization.

19949019426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5488 (or 5485 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The spelling of 19949019426 in words is "nineteen billion, nine hundred forty-nine million, nineteen thousand, four hundred twenty-six".