19220879 has 4 divisors (see below), whose sum is σ = 19270680. Its totient is φ = 19171080.

The previous prime is 19220849. The next prime is 19220921. The reversal of 19220879 is 97802291.

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-19220879 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 (19220849) 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, 24317 + ... + 25094.

It is an arithmetic number, because the mean of its divisors is an integer number (4817670).

Almost surely, 2^19220879 is an apocalyptic number.

19220879 is a deficient number, since it is larger than the sum of its proper divisors (49801).

19220879 is an equidigital number, since it uses as much as digits as its factorization.

19220879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49800.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 19220879 is about 4384.1622917041. The cubic root of 19220879 is about 267.8702079993.

The spelling of 19220879 in words is "nineteen million, two hundred twenty thousand, eight hundred seventy-nine".