998439911 has 16 divisors (see below), whose sum is σ = 1209216000. Its totient is φ = 805305888.

The previous prime is 998439901. The next prime is 998439961. The reversal of 998439911 is 119934899.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998439911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998439901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5375 + ... + 45008.

It is an arithmetic number, because the mean of its divisors is an integer number (75576000).

Almost surely, 2^998439911 is an apocalyptic number.

998439911 is a deficient number, since it is larger than the sum of its proper divisors (210776089).

998439911 is a wasteful number, since it uses less digits than its factorization.

998439911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50558.

The product of its digits is 629856, while the sum is 53.

The square root of 998439911 is about 31598.0998004627. The cubic root of 998439911 is about 999.4796996678.

The spelling of 998439911 in words is "nine hundred ninety-eight million, four hundred thirty-nine thousand, nine hundred eleven".