9978081 has 8 divisors (see below), whose sum is σ = 13336704. Its totient is φ = 6635760.

The previous prime is 9978079. The next prime is 9978103. The reversal of 9978081 is 1808799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9978081 - 2¹ = 9978079 is a prime.

It is a super-2 number, since 2×9978081² = 199124200885122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (9978041) 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, 2566 + ... + 5151.

It is an arithmetic number, because the mean of its divisors is an integer number (1667088).

Almost surely, 2^9978081 is an apocalyptic number.

It is an amenable number.

9978081 is a deficient number, since it is larger than the sum of its proper divisors (3358623).

9978081 is a wasteful number, since it uses less digits than its factorization.

9978081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8151.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 9978081 is about 3158.8100607666. The cubic root of 9978081 is about 215.2859436739.

The spelling of 9978081 in words is "nine million, nine hundred seventy-eight thousand, eighty-one".