977766397 has 8 divisors (see below), whose sum is σ = 986143032. Its totient is φ = 969408000.

The previous prime is 977766389. The next prime is 977766437. The reversal of 977766397 is 793667779.

It can be written as a sum of positive squares in 4 ways, for example, as 350213796 + 627552601 = 18714^2 + 25051^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 977766397 - 2³ = 977766389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977766497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116647 + ... + 124747.

It is an arithmetic number, because the mean of its divisors is an integer number (123267879).

Almost surely, 2^977766397 is an apocalyptic number.

It is an amenable number.

977766397 is a deficient number, since it is larger than the sum of its proper divisors (8376635).

977766397 is a wasteful number, since it uses less digits than its factorization.

977766397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9119.

The product of its digits is 21003948, while the sum is 61.

The square root of 977766397 is about 31269.2564190452. The cubic root of 977766397 is about 992.5331844319.

The spelling of 977766397 in words is "nine hundred seventy-seven million, seven hundred sixty-six thousand, three hundred ninety-seven".