210439993 has 2 divisors, whose sum is σ = 210439994. Its totient is φ = 210439992.

The previous prime is 210439967. The next prime is 210440017. The reversal of 210439993 is 399934012.

210439993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127848249 + 82591744 = 11307^2 + 9088^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210439993 is a prime.

It is not a weakly prime, because it can be changed into another prime (210439093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105219996 + 105219997.

It is an arithmetic number, because the mean of its divisors is an integer number (105219997).

Almost surely, 2^210439993 is an apocalyptic number.

It is an amenable number.

210439993 is a deficient number, since it is larger than the sum of its proper divisors (1).

210439993 is an equidigital number, since it uses as much as digits as its factorization.

210439993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 210439993 is about 14506.5500033606. The cubic root of 210439993 is about 594.8070301424.

The spelling of 210439993 in words is "two hundred ten million, four hundred thirty-nine thousand, nine hundred ninety-three".