9988642 has 16 divisors (see below), whose sum is σ = 16140960. Its totient is φ = 4620672.

The previous prime is 9988633. The next prime is 9988687. The reversal of 9988642 is 2468899.

It is an Ulam number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9988592 and 9988601.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1423 + ... + 4690.

It is an arithmetic number, because the mean of its divisors is an integer number (1008810).

Almost surely, 2^9988642 is an apocalyptic number.

9988642 is a deficient number, since it is larger than the sum of its proper divisors (6152318).

9988642 is a wasteful number, since it uses less digits than its factorization.

9988642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6177.

The product of its digits is 248832, while the sum is 46.

The square root of 9988642 is about 3160.4812924616. The cubic root of 9988642 is about 215.3618712051.

The spelling of 9988642 in words is "nine million, nine hundred eighty-eight thousand, six hundred forty-two".