9691988 has 6 divisors (see below), whose sum is σ = 16960986. Its totient is φ = 4845992.

The previous prime is 9691987. The next prime is 9691999. The reversal of 9691988 is 8891969.

9691988 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9132484 + 559504 = 3022^2 + 748^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9691987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1211495 + ... + 1211502.

It is an arithmetic number, because the mean of its divisors is an integer number (2826831).

Almost surely, 2^9691988 is an apocalyptic number.

It is an amenable number.

9691988 is a deficient number, since it is larger than the sum of its proper divisors (7268998).

9691988 is a wasteful number, since it uses less digits than its factorization.

9691988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2423001 (or 2422999 counting only the distinct ones).

The product of its digits is 279936, while the sum is 50.

The square root of 9691988 is about 3113.1957856839. The cubic root of 9691988 is about 213.2083892943.

The spelling of 9691988 in words is "nine million, six hundred ninety-one thousand, nine hundred eighty-eight".