6940390213 has 2 divisors, whose sum is σ = 6940390214. Its totient is φ = 6940390212.

The previous prime is 6940390159. The next prime is 6940390253. The reversal of 6940390213 is 3120930496.

6940390213 is digitally balanced in base 3, 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., 4599959329 + 2340430884 = 67823^2 + 48378^2 .

It is a cyclic number.

It is not a de Polignac number, because 6940390213 - 2¹⁷ = 6940259141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6940390253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3470195106 + 3470195107.

It is an arithmetic number, because the mean of its divisors is an integer number (3470195107).

Almost surely, 2^6940390213 is an apocalyptic number.

It is an amenable number.

6940390213 is a deficient number, since it is larger than the sum of its proper divisors (1).

6940390213 is an equidigital number, since it uses as much as digits as its factorization.

6940390213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 6940390213 is about 83309.0043932827. The cubic root of 6940390213 is about 1907.4857237294.

The spelling of 6940390213 in words is "six billion, nine hundred forty million, three hundred ninety thousand, two hundred thirteen".