19890275047 has 4 divisors (see below), whose sum is σ = 20076165576. Its totient is φ = 19704384520.

The previous prime is 19890275021. The next prime is 19890275051. The reversal of 19890275047 is 74057209891.

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-19890275047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19890274985 and 19890275003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19890275747) 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, 92945104 + ... + 92945317.

It is an arithmetic number, because the mean of its divisors is an integer number (5019041394).

Almost surely, 2^19890275047 is an apocalyptic number.

19890275047 is a deficient number, since it is larger than the sum of its proper divisors (185890529).

19890275047 is a wasteful number, since it uses less digits than its factorization.

19890275047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185890528.

The product of its (nonzero) digits is 1270080, while the sum is 52.

The spelling of 19890275047 in words is "nineteen billion, eight hundred ninety million, two hundred seventy-five thousand, forty-seven".