19420939 has 2 divisors, whose sum is σ = 19420940. Its totient is φ = 19420938.

The previous prime is 19420927. The next prime is 19420943. The reversal of 19420939 is 93902491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19420939 - 2¹¹ = 19418891 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19420898 and 19420907.

It is not a weakly prime, because it can be changed into another prime (19420979) 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, 9710469 + 9710470.

It is an arithmetic number, because the mean of its divisors is an integer number (9710470).

Almost surely, 2^19420939 is an apocalyptic number.

19420939 is a deficient number, since it is larger than the sum of its proper divisors (1).

19420939 is an equidigital number, since it uses as much as digits as its factorization.

19420939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 19420939 is about 4406.9194455992. The cubic root of 19420939 is about 268.7963753394.

The spelling of 19420939 in words is "nineteen million, four hundred twenty thousand, nine hundred thirty-nine".