9989427 has 32 divisors (see below), whose sum is σ = 16128000. Its totient is φ = 5378688.

The previous prime is 9989423. The next prime is 9989431. The reversal of 9989427 is 7249899.

It is a happy number.

9989427 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (9989423) and next prime (9989431).

It is not a de Polignac number, because 9989427 - 2² = 9989423 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

9989427 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9989423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28449 + ... + 28797.

It is an arithmetic number, because the mean of its divisors is an integer number (504000).

Almost surely, 2^9989427 is an apocalyptic number.

9989427 is a deficient number, since it is larger than the sum of its proper divisors (6138573).

9989427 is a wasteful number, since it uses less digits than its factorization.

9989427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435.

The product of its digits is 326592, while the sum is 48.

The square root of 9989427 is about 3160.6054799674. The cubic root of 9989427 is about 215.3675127675.

The spelling of 9989427 in words is "nine million, nine hundred eighty-nine thousand, four hundred twenty-seven".