988646489 has 4 divisors (see below), whose sum is σ = 1012759860. Its totient is φ = 964533120.

The previous prime is 988646473. The next prime is 988646501. The reversal of 988646489 is 984646889.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 984646889 = 29 ⋅33953341.

It can be written as a sum of positive squares in 2 ways, for example, as 112190464 + 876456025 = 10592^2 + 29605^2 .

It is a cyclic number.

It is not a de Polignac number, because 988646489 - 2⁴ = 988646473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (988646429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12056624 + ... + 12056705.

It is an arithmetic number, because the mean of its divisors is an integer number (253189965).

Almost surely, 2^988646489 is an apocalyptic number.

It is an amenable number.

988646489 is a deficient number, since it is larger than the sum of its proper divisors (24113371).

988646489 is a wasteful number, since it uses less digits than its factorization.

988646489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24113370.

The product of its digits is 23887872, while the sum is 62.

The square root of 988646489 is about 31442.7493867823. The cubic root of 988646489 is about 996.2010828368.

The spelling of 988646489 in words is "nine hundred eighty-eight million, six hundred forty-six thousand, four hundred eighty-nine".