988639893 has 12 divisors (see below), whose sum is σ = 1428331788. Its totient is φ = 658956480.

The previous prime is 988639859. The next prime is 988639933. The reversal of 988639893 is 398936889.

It can be written as a sum of positive squares in 2 ways, for example, as 805254129 + 183385764 = 28377^2 + 13542^2 .

It is not a de Polignac number, because 988639893 - 2⁸ = 988639637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 988639893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (988634893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54313 + ... + 70193.

It is an arithmetic number, because the mean of its divisors is an integer number (119027649).

Almost surely, 2^988639893 is an apocalyptic number.

It is an amenable number.

988639893 is a deficient number, since it is larger than the sum of its proper divisors (439691895).

988639893 is a wasteful number, since it uses less digits than its factorization.

988639893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22804 (or 22801 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 63.

The square root of 988639893 is about 31442.6444975610. The cubic root of 988639893 is about 996.1988673644.

The spelling of 988639893 in words is "nine hundred eighty-eight million, six hundred thirty-nine thousand, eight hundred ninety-three".