988646889 has 4 divisors (see below), whose sum is σ = 1318195856. Its totient is φ = 659097924.

The previous prime is 988646887. The next prime is 988646891.

988646889 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (988646887) and next prime (988646891).

It is not a de Polignac number, because 988646889 - 2¹ = 988646887 is a prime.

It is a super-2 number, since 2×988646889² = 1954845342258756642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (988646887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164774479 + ... + 164774484.

It is an arithmetic number, because the mean of its divisors is an integer number (329548964).

Almost surely, 2^988646889 is an apocalyptic number.

It is an amenable number.

988646889 is a deficient number, since it is larger than the sum of its proper divisors (329548967).

988646889 is a wasteful number, since it uses less digits than its factorization.

988646889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329548966.

The product of its digits is 47775744, while the sum is 66.

The square root of 988646889 is about 31442.7557475486. The cubic root of 988646889 is about 996.2012171889.

The spelling of 988646889 in words is "nine hundred eighty-eight million, six hundred forty-six thousand, eight hundred eighty-nine".