7977457 has 2 divisors, whose sum is σ = 7977458. Its totient is φ = 7977456.

The previous prime is 7977443. The next prime is 7977503. The reversal of 7977457 is 7547797.

It is an a-pointer prime, because the next prime (7977503) can be obtained adding 7977457 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6130576 + 1846881 = 2476^2 + 1359^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7977457 is a prime.

It is not a weakly prime, because it can be changed into another prime (7977157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3988728 + 3988729.

It is an arithmetic number, because the mean of its divisors is an integer number (3988729).

Almost surely, 2^7977457 is an apocalyptic number.

It is an amenable number.

7977457 is a deficient number, since it is larger than the sum of its proper divisors (1).

7977457 is an equidigital number, since it uses as much as digits as its factorization.

7977457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432180, while the sum is 46.

The square root of 7977457 is about 2824.4392363795. The cubic root of 7977457 is about 199.8119649361.

The spelling of 7977457 in words is "seven million, nine hundred seventy-seven thousand, four hundred fifty-seven".