938781457 has 2 divisors, whose sum is σ = 938781458. Its totient is φ = 938781456.

The previous prime is 938781433. The next prime is 938781479. The reversal of 938781457 is 754187839.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 935809281 + 2972176 = 30591^2 + 1724^2 .

It is an emirp because it is prime and its reverse (754187839) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 938781457 - 2¹¹ = 938779409 is a prime.

It is not a weakly prime, because it can be changed into another prime (938781407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 469390728 + 469390729.

It is an arithmetic number, because the mean of its divisors is an integer number (469390729).

Almost surely, 2^938781457 is an apocalyptic number.

It is an amenable number.

938781457 is a deficient number, since it is larger than the sum of its proper divisors (1).

938781457 is an equidigital number, since it uses as much as digits as its factorization.

938781457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 52.

The square root of 938781457 is about 30639.5407439472. The cubic root of 938781457 is about 979.1626392261.

The spelling of 938781457 in words is "nine hundred thirty-eight million, seven hundred eighty-one thousand, four hundred fifty-seven".