19909741 has 2 divisors, whose sum is σ = 19909742. Its totient is φ = 19909740.

The previous prime is 19909691. The next prime is 19909753. The reversal of 19909741 is 14790991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14976900 + 4932841 = 3870^2 + 2221^2 .

It is a cyclic number.

It is not a de Polignac number, because 19909741 - 2⁹ = 19909229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19909694 and 19909703.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19709741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9954870 + 9954871.

It is an arithmetic number, because the mean of its divisors is an integer number (9954871).

Almost surely, 2^19909741 is an apocalyptic number.

It is an amenable number.

19909741 is a deficient number, since it is larger than the sum of its proper divisors (1).

19909741 is an equidigital number, since it uses as much as digits as its factorization.

19909741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 40.

The square root of 19909741 is about 4462.0332809158. The cubic root of 19909741 is about 271.0328114845.

The spelling of 19909741 in words is "nineteen million, nine hundred nine thousand, seven hundred forty-one".