15347939840 has 80 divisors (see below), whose sum is σ = 37089626112. Its totient is φ = 6090706944.

The previous prime is 15347939839. The next prime is 15347939861. The reversal of 15347939840 is 4893974351.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301517 + ... + 348723.

Almost surely, 2^15347939840 is an apocalyptic number.

15347939840 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 15347939840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18544813056).

15347939840 is an abundant number, since it is smaller than the sum of its proper divisors (21741686272).

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

15347939840 is an equidigital number, since it uses as much as digits as its factorization.

15347939840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47357 (or 47341 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 15347939840 in words is "fifteen billion, three hundred forty-seven million, nine hundred thirty-nine thousand, eight hundred forty".