998739937898 has 8 divisors (see below), whose sum is σ = 1498114248708. Its totient is φ = 499368521664.

The previous prime is 998739937861. The next prime is 998739937901. The reversal of 998739937898 is 898739937899.

It can be written as a sum of positive squares in 2 ways, for example, as 683824801969 + 314915135929 = 826937^2 + 561173^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 695840 + ... + 1575332.

Almost surely, 2^998739937898 is an apocalyptic number.

998739937898 is a deficient number, since it is larger than the sum of its proper divisors (499374310810).

998739937898 is a wasteful number, since it uses less digits than its factorization.

998739937898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447288.

The product of its digits is 13332791808, while the sum is 89.

Subtracting from 998739937898 its reverse (898739937899), we obtain a palindrome (99999999999).

The spelling of 998739937898 in words is "nine hundred ninety-eight billion, seven hundred thirty-nine million, nine hundred thirty-seven thousand, eight hundred ninety-eight".