93438721 has 2 divisors, whose sum is σ = 93438722. Its totient is φ = 93438720.

The previous prime is 93438703. The next prime is 93438731. The reversal of 93438721 is 12783439.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89870400 + 3568321 = 9480^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 93438721 - 2⁵ = 93438689 is a prime.

It is not a weakly prime, because it can be changed into another prime (93438701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 46719360 + 46719361.

It is an arithmetic number, because the mean of its divisors is an integer number (46719361).

Almost surely, 2^93438721 is an apocalyptic number.

It is an amenable number.

93438721 is a deficient number, since it is larger than the sum of its proper divisors (1).

93438721 is an equidigital number, since it uses as much as digits as its factorization.

93438721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 93438721 is about 9666.3706219035. The cubic root of 93438721 is about 453.7768071750.

The spelling of 93438721 in words is "ninety-three million, four hundred thirty-eight thousand, seven hundred twenty-one".