19854137 has 2 divisors, whose sum is σ = 19854138. Its totient is φ = 19854136.

The previous prime is 19854061. The next prime is 19854139. The reversal of 19854137 is 73145891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16152361 + 3701776 = 4019^2 + 1924^2 .

It is a cyclic number.

It is not a de Polignac number, because 19854137 - 2¹⁸ = 19591993 is a prime.

Together with 19854139, it forms a pair of twin primes.

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 19854137.

It is not a weakly prime, because it can be changed into another prime (19854139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9927068 + 9927069.

It is an arithmetic number, because the mean of its divisors is an integer number (9927069).

Almost surely, 2^19854137 is an apocalyptic number.

It is an amenable number.

19854137 is a deficient number, since it is larger than the sum of its proper divisors (1).

19854137 is an equidigital number, since it uses as much as digits as its factorization.

19854137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 19854137 is about 4455.7981327704. The cubic root of 19854137 is about 270.7802624112.

It can be divided in two parts, 19854 and 137, that added together give a palindrome (19991).

The spelling of 19854137 in words is "nineteen million, eight hundred fifty-four thousand, one hundred thirty-seven".