998781212 has 72 divisors (see below), whose sum is σ = 2186451792. Its totient is φ = 394368000.

The previous prime is 998781181. The next prime is 998781241. The reversal of 998781212 is 212187899.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122462 + ... + 130362.

It is an arithmetic number, because the mean of its divisors is an integer number (30367386).

Almost surely, 2^998781212 is an apocalyptic number.

It is a pronic number, being equal to 31603×31604.

It is an amenable number.

998781212 is an abundant number, since it is smaller than the sum of its proper divisors (1187670580).

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

998781212 is a wasteful number, since it uses less digits than its factorization.

998781212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7959 (or 7944 counting only the distinct ones).

The product of its digits is 145152, while the sum is 47.

The square root of 998781212 is about 31603.4999960447. The cubic root of 998781212 is about 999.5935721721.

The spelling of 998781212 in words is "nine hundred ninety-eight million, seven hundred eighty-one thousand, two hundred twelve".