19228871 has 4 divisors (see below), whose sum is σ = 19399152. Its totient is φ = 19058592.

The previous prime is 19228861. The next prime is 19228873. The reversal of 19228871 is 17882291.

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-19228871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19228873) 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, 84971 + ... + 85196.

It is an arithmetic number, because the mean of its divisors is an integer number (4849788).

Almost surely, 2^19228871 is an apocalyptic number.

19228871 is a deficient number, since it is larger than the sum of its proper divisors (170281).

19228871 is a wasteful number, since it uses less digits than its factorization.

19228871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170280.

The product of its digits is 16128, while the sum is 38.

The square root of 19228871 is about 4385.0736595866. The cubic root of 19228871 is about 267.9073294729.

The spelling of 19228871 in words is "nineteen million, two hundred twenty-eight thousand, eight hundred seventy-one".