19834979 has 2 divisors, whose sum is σ = 19834980. Its totient is φ = 19834978.

The previous prime is 19834961. The next prime is 19834999. The reversal of 19834979 is 97943891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19834979 - 2²⁴ = 3057763 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19834949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9917489 + 9917490.

It is an arithmetic number, because the mean of its divisors is an integer number (9917490).

Almost surely, 2^19834979 is an apocalyptic number.

19834979 is a deficient number, since it is larger than the sum of its proper divisors (1).

19834979 is an equidigital number, since it uses as much as digits as its factorization.

19834979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 50.

The square root of 19834979 is about 4453.6478307114. The cubic root of 19834979 is about 270.6931390452.

The spelling of 19834979 in words is "nineteen million, eight hundred thirty-four thousand, nine hundred seventy-nine".