19897853 has 2 divisors, whose sum is σ = 19897854. Its totient is φ = 19897852.

The previous prime is 19897847. The next prime is 19897859. The reversal of 19897853 is 35879891.

It is a balanced prime because it is at equal distance from previous prime (19897847) and next prime (19897859).

It can be written as a sum of positive squares in only one way, i.e., 19829209 + 68644 = 4453^2 + 262^2 .

It is a cyclic number.

It is not a de Polignac number, because 19897853 - 2⁶ = 19897789 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19897859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9948926 + 9948927.

It is an arithmetic number, because the mean of its divisors is an integer number (9948927).

Almost surely, 2^19897853 is an apocalyptic number.

It is an amenable number.

19897853 is a deficient number, since it is larger than the sum of its proper divisors (1).

19897853 is an equidigital number, since it uses as much as digits as its factorization.

19897853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 50.

The square root of 19897853 is about 4460.7009538861. The cubic root of 19897853 is about 270.9788566630.

The spelling of 19897853 in words is "nineteen million, eight hundred ninety-seven thousand, eight hundred fifty-three".