17947428115 has 4 divisors (see below), whose sum is σ = 21536913744. Its totient is φ = 14357942488.

The previous prime is 17947428091. The next prime is 17947428127. The reversal of 17947428115 is 51182474971.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17947428115 is a prime.

It is a super-2 number, since 2×17947428115² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1794742807 + ... + 1794742816.

It is an arithmetic number, because the mean of its divisors is an integer number (5384228436).

Almost surely, 2^17947428115 is an apocalyptic number.

17947428115 is a deficient number, since it is larger than the sum of its proper divisors (3589485629).

17947428115 is an equidigital number, since it uses as much as digits as its factorization.

17947428115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3589485628.

The product of its digits is 564480, while the sum is 49.

The spelling of 17947428115 in words is "seventeen billion, nine hundred forty-seven million, four hundred twenty-eight thousand, one hundred fifteen".