19505939 has 2 divisors, whose sum is σ = 19505940. Its totient is φ = 19505938.

The previous prime is 19505933. The next prime is 19505977. The reversal of 19505939 is 93950591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19505939 - 2¹² = 19501843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19505896 and 19505905.

It is not a weakly prime, because it can be changed into another prime (19505933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9752969 + 9752970.

It is an arithmetic number, because the mean of its divisors is an integer number (9752970).

Almost surely, 2^19505939 is an apocalyptic number.

19505939 is a deficient number, since it is larger than the sum of its proper divisors (1).

19505939 is an equidigital number, since it uses as much as digits as its factorization.

19505939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54675, while the sum is 41.

The square root of 19505939 is about 4416.5528413006. The cubic root of 19505939 is about 269.1879533860.

The spelling of 19505939 in words is "nineteen million, five hundred five thousand, nine hundred thirty-nine".