19940237 has 2 divisors, whose sum is σ = 19940238. Its totient is φ = 19940236.

The previous prime is 19940191. The next prime is 19940273. The reversal of 19940237 is 73204991.

Together with next prime (19940273) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11095561 + 8844676 = 3331^2 + 2974^2 .

It is a cyclic number.

It is not a de Polignac number, because 19940237 - 2¹² = 19936141 is a prime.

It is a super-2 number, since 2×19940237² = 795226103232338, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19940197 and 19940206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19943237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9970118 + 9970119.

It is an arithmetic number, because the mean of its divisors is an integer number (9970119).

Almost surely, 2^19940237 is an apocalyptic number.

It is an amenable number.

19940237 is a deficient number, since it is larger than the sum of its proper divisors (1).

19940237 is an equidigital number, since it uses as much as digits as its factorization.

19940237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 19940237 is about 4465.4492495157. The cubic root of 19940237 is about 271.1711223432.

The spelling of 19940237 in words is "nineteen million, nine hundred forty thousand, two hundred thirty-seven".