19847398027 has 4 divisors (see below), whose sum is σ = 20710328400. Its totient is φ = 18984467656.

The previous prime is 19847397989. The next prime is 19847398037. The reversal of 19847398027 is 72089374891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72089374891 = 61 ⋅1181793031.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19847398027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19847398037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 431465152 + ... + 431465197.

It is an arithmetic number, because the mean of its divisors is an integer number (5177582100).

Almost surely, 2^19847398027 is an apocalyptic number.

19847398027 is a deficient number, since it is larger than the sum of its proper divisors (862930373).

19847398027 is an equidigital number, since it uses as much as digits as its factorization.

19847398027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862930372.

The product of its (nonzero) digits is 6096384, while the sum is 58.

The spelling of 19847398027 in words is "nineteen billion, eight hundred forty-seven million, three hundred ninety-eight thousand, twenty-seven".