998740188 has 72 divisors (see below), whose sum is σ = 2589835248. Its totient is φ = 324350208.

The previous prime is 998740181. The next prime is 998740189. The reversal of 998740188 is 881047899.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998740181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1047520 + ... + 1048472.

It is an arithmetic number, because the mean of its divisors is an integer number (35969934).

Almost surely, 2^998740188 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998740188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1294917624).

998740188 is an abundant number, since it is smaller than the sum of its proper divisors (1591095060).

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

998740188 is a wasteful number, since it uses less digits than its factorization.

998740188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683 (or 1678 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The square root of 998740188 is about 31602.8509473433. The cubic root of 998740188 is about 999.5798861958.

The spelling of 998740188 in words is "nine hundred ninety-eight million, seven hundred forty thousand, one hundred eighty-eight".