40820093 has 2 divisors, whose sum is σ = 40820094. Its totient is φ = 40820092.

The previous prime is 40820083. The next prime is 40820107. The reversal of 40820093 is 39002804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21696964 + 19123129 = 4658^2 + 4373^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40820093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40820083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20410046 + 20410047.

It is an arithmetic number, because the mean of its divisors is an integer number (20410047).

Almost surely, 2^40820093 is an apocalyptic number.

It is an amenable number.

40820093 is a deficient number, since it is larger than the sum of its proper divisors (1).

40820093 is an equidigital number, since it uses as much as digits as its factorization.

40820093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 40820093 is about 6389.0604160549. The cubic root of 40820093 is about 344.3166280951.

Adding to 40820093 its reverse (39002804), we get a palindrome (79822897).

The spelling of 40820093 in words is "forty million, eight hundred twenty thousand, ninety-three".