19780853 has 2 divisors, whose sum is σ = 19780854. Its totient is φ = 19780852.

The previous prime is 19780837. The next prime is 19780861. The reversal of 19780853 is 35808791.

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., 13010449 + 6770404 = 3607^2 + 2602^2 .

It is a cyclic number.

It is not a de Polignac number, because 19780853 - 2⁴ = 19780837 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19780853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19782853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9890426 + 9890427.

It is an arithmetic number, because the mean of its divisors is an integer number (9890427).

Almost surely, 2^19780853 is an apocalyptic number.

It is an amenable number.

19780853 is a deficient number, since it is larger than the sum of its proper divisors (1).

19780853 is an equidigital number, since it uses as much as digits as its factorization.

19780853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 19780853 is about 4447.5670877458. The cubic root of 19780853 is about 270.4466908522.

The spelling of 19780853 in words is "nineteen million, seven hundred eighty thousand, eight hundred fifty-three".