19504939 has 2 divisors, whose sum is σ = 19504940. Its totient is φ = 19504938.

The previous prime is 19504937. The next prime is 19504951. The reversal of 19504939 is 93940591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19504939 - 2¹ = 19504937 is a prime.

Together with 19504937, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19504931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9752469 + 9752470.

It is an arithmetic number, because the mean of its divisors is an integer number (9752470).

Almost surely, 2^19504939 is an apocalyptic number.

19504939 is a deficient number, since it is larger than the sum of its proper divisors (1).

19504939 is an equidigital number, since it uses as much as digits as its factorization.

19504939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 19504939 is about 4416.4396293847. The cubic root of 19504939 is about 269.1833532049.

It can be divided in two parts, 1950 and 4939, that added together give a square (6889 = 83²).

The spelling of 19504939 in words is "nineteen million, five hundred four thousand, nine hundred thirty-nine".