9980866 has 16 divisors (see below), whose sum is σ = 17152704.
Its totient is φ = 4266864.
The previous prime is 9980863. The next prime is 9980869. The reversal of 9980866 is 6680899.
It is a happy number.
It is an interprime number because it is at equal distance from previous prime (9980863) and next prime (9980869).
It is a super-2 number, since 2×99808662 = 199235372219912, which contains 22 as substring.
9980866 is a strobogrammatic number because it is the same when read upside-down.
It is not an unprimeable number, because it can be changed into a prime (9980863) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8001 + ... + 9163.
It is an arithmetic number, because the mean of its divisors is an integer number (1072044).
Almost surely, 29980866 is an apocalyptic number.
9980866 is a deficient number, since it is larger than the sum of its proper divisors (7171838).
9980866 is a wasteful number, since it uses less digits than its factorization.
9980866 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1785.
The product of its (nonzero) digits is 186624, while the sum is 46.
The square root of 9980866 is about 3159.2508605681.
The cubic root of 9980866 is about 215.3059714254.
The spelling of 9980866 in words is "nine million, nine hundred eighty thousand, eight hundred sixty-six".