19795409 has 2 divisors, whose sum is σ = 19795410. Its totient is φ = 19795408.

The previous prime is 19795403. The next prime is 19795459. The reversal of 19795409 is 90459791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19775809 + 19600 = 4447^2 + 140^2 .

It is a cyclic number.

It is not a de Polignac number, because 19795409 - 2⁴ = 19795393 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19795409.

It is not a weakly prime, because it can be changed into another prime (19795403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9897704 + 9897705.

It is an arithmetic number, because the mean of its divisors is an integer number (9897705).

Almost surely, 2^19795409 is an apocalyptic number.

It is an amenable number.

19795409 is a deficient number, since it is larger than the sum of its proper divisors (1).

19795409 is an equidigital number, since it uses as much as digits as its factorization.

19795409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 44.

The square root of 19795409 is about 4449.2031870887. The cubic root of 19795409 is about 270.5130118347.

The spelling of 19795409 in words is "nineteen million, seven hundred ninety-five thousand, four hundred nine".