998991126 has 36 divisors (see below), whose sum is σ = 2517867612. Its totient is φ = 285425784.

The previous prime is 998991121. The next prime is 998991167. The reversal of 998991126 is 621199899.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998991121) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 565440 + ... + 567203.

It is an arithmetic number, because the mean of its divisors is an integer number (69940767).

Almost surely, 2^998991126 is an apocalyptic number.

998991126 is an abundant number, since it is smaller than the sum of its proper divisors (1518876486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

998991126 is a wasteful number, since it uses less digits than its factorization.

998991126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132665 (or 1132655 counting only the distinct ones).

The product of its digits is 629856, while the sum is 54.

The square root of 998991126 is about 31606.8208777789. The cubic root of 998991126 is about 999.6635955114.

It can be divided in two parts, 99899 and 1126, that added together give a triangular number (101025 = T₄₄₉).

The spelling of 998991126 in words is "nine hundred ninety-eight million, nine hundred ninety-one thousand, one hundred twenty-six".