918910397 has 2 divisors, whose sum is σ = 918910398. Its totient is φ = 918910396.

The previous prime is 918910351. The next prime is 918910411. The reversal of 918910397 is 793019819.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 810313156 + 108597241 = 28466^2 + 10421^2 .

It is a cyclic number.

It is not a de Polignac number, because 918910397 - 2⁸ = 918910141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (918910297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459455198 + 459455199.

It is an arithmetic number, because the mean of its divisors is an integer number (459455199).

Almost surely, 2^918910397 is an apocalyptic number.

It is an amenable number.

918910397 is a deficient number, since it is larger than the sum of its proper divisors (1).

918910397 is an equidigital number, since it uses as much as digits as its factorization.

918910397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 918910397 is about 30313.5348813034. The cubic root of 918910397 is about 972.2047123259.

The spelling of 918910397 in words is "nine hundred eighteen million, nine hundred ten thousand, three hundred ninety-seven".