7987457 has 2 divisors, whose sum is σ = 7987458. Its totient is φ = 7987456.

The previous prime is 7987439. The next prime is 7987459. The reversal of 7987457 is 7547897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5550736 + 2436721 = 2356^2 + 1561^2 .

It is a cyclic number.

It is not a de Polignac number, because 7987457 - 2⁶ = 7987393 is a prime.

Together with 7987459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7987459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3993728 + 3993729.

It is an arithmetic number, because the mean of its divisors is an integer number (3993729).

Almost surely, 2^7987457 is an apocalyptic number.

It is an amenable number.

7987457 is a deficient number, since it is larger than the sum of its proper divisors (1).

7987457 is an equidigital number, since it uses as much as digits as its factorization.

7987457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 493920, while the sum is 47.

The square root of 7987457 is about 2826.2089448588. The cubic root of 7987457 is about 199.8954203250.

The spelling of 7987457 in words is "seven million, nine hundred eighty-seven thousand, four hundred fifty-seven".