19954939 has 2 divisors, whose sum is σ = 19954940. Its totient is φ = 19954938.

The previous prime is 19954933. The next prime is 19954969. The reversal of 19954939 is 93945991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19954939 - 2¹⁵ = 19922171 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19954892 and 19954901.

It is not a weakly prime, because it can be changed into another prime (19954933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9977469 + 9977470.

It is an arithmetic number, because the mean of its divisors is an integer number (9977470).

Almost surely, 2^19954939 is an apocalyptic number.

19954939 is a deficient number, since it is larger than the sum of its proper divisors (1).

19954939 is an equidigital number, since it uses as much as digits as its factorization.

19954939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 393660, while the sum is 49.

The square root of 19954939 is about 4467.0951411404. The cubic root of 19954939 is about 271.2377510803.

The spelling of 19954939 in words is "nineteen million, nine hundred fifty-four thousand, nine hundred thirty-nine".