19309338740 has 48 divisors (see below), whose sum is σ = 41788150992. Its totient is φ = 7489253376.

The previous prime is 19309338733. The next prime is 19309338793. The reversal of 19309338740 is 4783390391.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 718561636 + 18590777104 = 26806^2 + 136348^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172292 + ... + 261348.

It is an arithmetic number, because the mean of its divisors is an integer number (870586479).

Almost surely, 2^19309338740 is an apocalyptic number.

19309338740 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 19309338740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20894075496).

19309338740 is an abundant number, since it is smaller than the sum of its proper divisors (22478812252).

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

19309338740 is a wasteful number, since it uses less digits than its factorization.

19309338740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89396 (or 89394 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 19309338740 in words is "nineteen billion, three hundred nine million, three hundred thirty-eight thousand, seven hundred forty".