19853455 has 4 divisors (see below), whose sum is σ = 23824152. Its totient is φ = 15882760.

The previous prime is 19853437. The next prime is 19853459. The reversal of 19853455 is 55435891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55435891 = 7 ⋅7919413.

It is a de Polignac number, because none of the positive numbers 2^k-19853455 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19853459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1985341 + ... + 1985350.

It is an arithmetic number, because the mean of its divisors is an integer number (5956038).

Almost surely, 2^19853455 is an apocalyptic number.

19853455 is a deficient number, since it is larger than the sum of its proper divisors (3970697).

19853455 is an equidigital number, since it uses as much as digits as its factorization.

19853455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3970696.

The product of its digits is 108000, while the sum is 40.

The square root of 19853455 is about 4455.7216026139. The cubic root of 19853455 is about 270.7771618944. Note that the first 3 decimals are identical.

The spelling of 19853455 in words is "nineteen million, eight hundred fifty-three thousand, four hundred fifty-five".