993998237 has 2 divisors, whose sum is σ = 993998238. Its totient is φ = 993998236.

The previous prime is 993998209. The next prime is 993998273. The reversal of 993998237 is 732899399.

Together with next prime (993998273) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 993888676 + 109561 = 31526^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 993998237 - 2¹⁴ = 993981853 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 (993998207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496999118 + 496999119.

It is an arithmetic number, because the mean of its divisors is an integer number (496999119).

Almost surely, 2^993998237 is an apocalyptic number.

It is an amenable number.

993998237 is a deficient number, since it is larger than the sum of its proper divisors (1).

993998237 is an equidigital number, since it uses as much as digits as its factorization.

993998237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6613488, while the sum is 59.

The square root of 993998237 is about 31527.7375813743. The cubic root of 993998237 is about 997.9953965836.

The spelling of 993998237 in words is "nine hundred ninety-three million, nine hundred ninety-eight thousand, two hundred thirty-seven".