19449318840 has 256 divisors, whose sum is σ = 71520537600. Its totient is φ = 4131938304.

The previous prime is 19449318839. The next prime is 19449318841. The reversal of 19449318840 is 4881394491.

It is an interprime number because it is at equal distance from previous prime (19449318839) and next prime (19449318841).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19449318841) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 834384 + ... + 857376.

It is an arithmetic number, because the mean of its divisors is an integer number (279377100).

Almost surely, 2^19449318840 is an apocalyptic number.

19449318840 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 19449318840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35760268800).

19449318840 is an abundant number, since it is smaller than the sum of its proper divisors (52071218760).

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

19449318840 is a wasteful number, since it uses less digits than its factorization.

19449318840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23086 (or 23082 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 51.

The spelling of 19449318840 in words is "nineteen billion, four hundred forty-nine million, three hundred eighteen thousand, eight hundred forty".