19872231 has 4 divisors (see below), whose sum is σ = 26496312. Its totient is φ = 13248152.

The previous prime is 19872227. The next prime is 19872241. The reversal of 19872231 is 13227891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13227891 = 3 ⋅4409297.

It is a cyclic number.

It is not a de Polignac number, because 19872231 - 2² = 19872227 is a prime.

It is a super-2 number, since 2×19872231² = 789811129834722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19872192 and 19872201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19872241) 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, 3312036 + ... + 3312041.

It is an arithmetic number, because the mean of its divisors is an integer number (6624078).

Almost surely, 2^19872231 is an apocalyptic number.

19872231 is a deficient number, since it is larger than the sum of its proper divisors (6624081).

19872231 is an equidigital number, since it uses as much as digits as its factorization.

19872231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6624080.

The product of its digits is 6048, while the sum is 33.

The square root of 19872231 is about 4457.8280585954. The cubic root of 19872231 is about 270.8624956580.

The spelling of 19872231 in words is "nineteen million, eight hundred seventy-two thousand, two hundred thirty-one".