19885237 has 2 divisors, whose sum is σ = 19885238. Its totient is φ = 19885236.

The previous prime is 19885231. The next prime is 19885241. The reversal of 19885237 is 73258891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18610596 + 1274641 = 4314^2 + 1129^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19885237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19885193 and 19885202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19885231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9942618 + 9942619.

It is an arithmetic number, because the mean of its divisors is an integer number (9942619).

Almost surely, 2^19885237 is an apocalyptic number.

It is an amenable number.

19885237 is a deficient number, since it is larger than the sum of its proper divisors (1).

19885237 is an equidigital number, since it uses as much as digits as its factorization.

19885237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 19885237 is about 4459.2866021372. The cubic root of 19885237 is about 270.9215742344.

It can be divided in two parts, 1988 and 5237, that added together give a square (7225 = 85²).

The spelling of 19885237 in words is "nineteen million, eight hundred eighty-five thousand, two hundred thirty-seven".