998949899 has 4 divisors (see below), whose sum is σ = 1022181336. Its totient is φ = 975718464.

The previous prime is 998949881. The next prime is 998949911.

998949899 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 998949899 - 2²⁸ = 730514443 is a prime.

It is a super-2 number, since 2×998949899² = 1995801801424220402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998949299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11615654 + ... + 11615739.

It is an arithmetic number, because the mean of its divisors is an integer number (255545334).

Almost surely, 2^998949899 is an apocalyptic number.

998949899 is a deficient number, since it is larger than the sum of its proper divisors (23231437).

998949899 is a wasteful number, since it uses less digits than its factorization.

998949899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23231436.

The product of its digits is 136048896, while the sum is 74.

The square root of 998949899 is about 31606.1686858752. The cubic root of 998949899 is about 999.6498437382.

The spelling of 998949899 in words is "nine hundred ninety-eight million, nine hundred forty-nine thousand, eight hundred ninety-nine".