998173540 has 96 divisors (see below), whose sum is σ = 2587463424. Its totient is φ = 314979840.

The previous prime is 998173507. The next prime is 998173549. The reversal of 998173540 is 45371899.

It is a happy number.

998173540 is a nontrivial binomial coefficient, being equal to C(44681, 2).

It is a super-2 number, since 2×998173540² = 1992700831912263200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (998173549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 893062 + ... + 894178.

It is an arithmetic number, because the mean of its divisors is an integer number (26952744).

Almost surely, 2^998173540 is an apocalyptic number.

998173540 is the 44680-th triangular number.

998173540 is the 14894-th centered nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998173540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1293731712).

998173540 is an abundant number, since it is smaller than the sum of its proper divisors (1589289884).

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

998173540 is a wasteful number, since it uses less digits than its factorization.

998173540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637 (or 1635 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 998173540 is about 31593.8845348273. The cubic root of 998173540 is about 999.3908089616.

It can be divided in two parts, 9981 and 73540, that added together give a 4-th power (83521 = 17⁴).

The spelling of 998173540 in words is "nine hundred ninety-eight million, one hundred seventy-three thousand, five hundred forty".