19879231 has 2 divisors, whose sum is σ = 19879232. Its totient is φ = 19879230.

The previous prime is 19879217. The next prime is 19879253. The reversal of 19879231 is 13297891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19879231 - 2¹¹ = 19877183 is a prime.

It is a super-2 number, since 2×19879231² = 790367650302722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19879031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9939615 + 9939616.

It is an arithmetic number, because the mean of its divisors is an integer number (9939616).

Almost surely, 2^19879231 is an apocalyptic number.

19879231 is a deficient number, since it is larger than the sum of its proper divisors (1).

19879231 is an equidigital number, since it uses as much as digits as its factorization.

19879231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 40.

The square root of 19879231 is about 4458.6131251769. The cubic root of 19879231 is about 270.8942957259.

The spelling of 19879231 in words is "nineteen million, eight hundred seventy-nine thousand, two hundred thirty-one".