34781993 has 2 divisors, whose sum is σ = 34781994. Its totient is φ = 34781992.

The previous prime is 34781987. The next prime is 34782019. The reversal of 34781993 is 39918743.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27583504 + 7198489 = 5252^2 + 2683^2 .

It is a cyclic number.

It is not a de Polignac number, because 34781993 - 2¹⁰ = 34780969 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (34781953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17390996 + 17390997.

It is an arithmetic number, because the mean of its divisors is an integer number (17390997).

Almost surely, 2^34781993 is an apocalyptic number.

It is an amenable number.

34781993 is a deficient number, since it is larger than the sum of its proper divisors (1).

34781993 is an equidigital number, since it uses as much as digits as its factorization.

34781993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 44.

The square root of 34781993 is about 5897.6260478264. The cubic root of 34781993 is about 326.4260585342.

The spelling of 34781993 in words is "thirty-four million, seven hundred eighty-one thousand, nine hundred ninety-three".