15439734420 has 96 divisors (see below), whose sum is σ = 47203309440. Its totient is φ = 3739637760.

The previous prime is 15439734397. The next prime is 15439734437. The reversal of 15439734420 is 2443793451.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 777576 + ... + 797184.

It is an arithmetic number, because the mean of its divisors is an integer number (491701140).

Almost surely, 2^15439734420 is an apocalyptic number.

15439734420 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 15439734420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23601654720).

15439734420 is an abundant number, since it is smaller than the sum of its proper divisors (31763575020).

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

15439734420 is a wasteful number, since it uses less digits than its factorization.

15439734420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20825 (or 20823 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

The spelling of 15439734420 in words is "fifteen billion, four hundred thirty-nine million, seven hundred thirty-four thousand, four hundred twenty".