7972777 has 2 divisors, whose sum is σ = 7972778. Its totient is φ = 7972776.

The previous prime is 7972771. The next prime is 7972781. The reversal of 7972777 is 7772797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7160976 + 811801 = 2676^2 + 901^2 .

It is an emirp because it is prime and its reverse (7772797) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7972777 - 2¹⁹ = 7448489 is a prime.

7972777 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (7972771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3986388 + 3986389.

It is an arithmetic number, because the mean of its divisors is an integer number (3986389).

Almost surely, 2^7972777 is an apocalyptic number.

It is an amenable number.

7972777 is a deficient number, since it is larger than the sum of its proper divisors (1).

7972777 is an equidigital number, since it uses as much as digits as its factorization.

7972777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302526, while the sum is 46.

The square root of 7972777 is about 2823.6106317975. The cubic root of 7972777 is about 199.7728838556.

The spelling of 7972777 in words is "seven million, nine hundred seventy-two thousand, seven hundred seventy-seven".