19309889742 has 128 divisors (see below), whose sum is σ = 46137434112. Its totient is φ = 5310844800.

The previous prime is 19309889719. The next prime is 19309889747. The reversal of 19309889742 is 24798890391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19309889747) 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, 18728767 + ... + 18729797.

It is an arithmetic number, because the mean of its divisors is an integer number (360448704).

Almost surely, 2^19309889742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19309889742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23068717056).

19309889742 is an abundant number, since it is smaller than the sum of its proper divisors (26827544370).

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

19309889742 is a wasteful number, since it uses less digits than its factorization.

19309889742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406.

The product of its (nonzero) digits is 7838208, while the sum is 60.

The spelling of 19309889742 in words is "nineteen billion, three hundred nine million, eight hundred eighty-nine thousand, seven hundred forty-two".