9861977 has 4 divisors (see below), whose sum is σ = 9980880. Its totient is φ = 9743076.

The previous prime is 9861967. The next prime is 9861983. The reversal of 9861977 is 7791689.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9861977 - 2⁶ = 9861913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9861947) 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, 59327 + ... + 59492.

It is an arithmetic number, because the mean of its divisors is an integer number (2495220).

Almost surely, 2^9861977 is an apocalyptic number.

It is an amenable number.

9861977 is a deficient number, since it is larger than the sum of its proper divisors (118903).

9861977 is a wasteful number, since it uses less digits than its factorization.

9861977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118902.

The product of its digits is 190512, while the sum is 47.

The square root of 9861977 is about 3140.3784803746. The cubic root of 9861977 is about 214.4476682757.

The spelling of 9861977 in words is "nine million, eight hundred sixty-one thousand, nine hundred seventy-seven".