7938457 has 2 divisors, whose sum is σ = 7938458. Its totient is φ = 7938456.

The previous prime is 7938443. The next prime is 7938481. The reversal of 7938457 is 7548397.

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., 6471936 + 1466521 = 2544^2 + 1211^2 .

It is an emirp because it is prime and its reverse (7548397) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7938457 is a prime.

It is not a weakly prime, because it can be changed into another prime (7938407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3969228 + 3969229.

It is an arithmetic number, because the mean of its divisors is an integer number (3969229).

Almost surely, 2^7938457 is an apocalyptic number.

It is an amenable number.

7938457 is a deficient number, since it is larger than the sum of its proper divisors (1).

7938457 is an equidigital number, since it uses as much as digits as its factorization.

7938457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 43.

The square root of 7938457 is about 2817.5267523131. The cubic root of 7938457 is about 199.4858208987.

The spelling of 7938457 in words is "seven million, nine hundred thirty-eight thousand, four hundred fifty-seven".