9978977 has 4 divisors (see below), whose sum is σ = 10046100. Its totient is φ = 9911856.

The previous prime is 9978961. The next prime is 9978989. The reversal of 9978977 is 7798799.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1661521 + 8317456 = 1289^2 + 2884^2 .

It is a cyclic number.

It is not a de Polignac number, because 9978977 - 2⁴ = 9978961 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 (9978277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33338 + ... + 33635.

It is an arithmetic number, because the mean of its divisors is an integer number (2511525).

Almost surely, 2^9978977 is an apocalyptic number.

It is an amenable number.

9978977 is a deficient number, since it is larger than the sum of its proper divisors (67123).

9978977 is a wasteful number, since it uses less digits than its factorization.

9978977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67122.

The product of its digits is 2000376, while the sum is 56.

The square root of 9978977 is about 3158.9518831410. The cubic root of 9978977 is about 215.2923874792.

The spelling of 9978977 in words is "nine million, nine hundred seventy-eight thousand, nine hundred seventy-seven".