9977918 has 4 divisors (see below), whose sum is σ = 14966880. Its totient is φ = 4988958.

The previous prime is 9977917. The next prime is 9977921. The reversal of 9977918 is 8197799.

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

It is a super-2 number, since 2×9977918² = 199117695229448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9977911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2494478 + ... + 2494481.

It is an arithmetic number, because the mean of its divisors is an integer number (3741720).

Almost surely, 2^9977918 is an apocalyptic number.

9977918 is a deficient number, since it is larger than the sum of its proper divisors (4988962).

9977918 is a wasteful number, since it uses less digits than its factorization.

9977918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4988961.

The product of its digits is 285768, while the sum is 50.

The square root of 9977918 is about 3158.7842598063. The cubic root of 9977918 is about 215.2847713777.

It can be divided in two parts, 997791 and 8, that added together give a palindrome (997799).

The spelling of 9977918 in words is "nine million, nine hundred seventy-seven thousand, nine hundred eighteen".