998812815 has 288 divisors, whose sum is σ = 2379269376. Its totient is φ = 352235520.

The previous prime is 998812813. The next prime is 998812831. The reversal of 998812815 is 518218899.

It is a Cunningham number, because it is equal to 31604²-1.

It is not a de Polignac number, because 998812815 - 2¹ = 998812813 is a prime.

It is a super-3 number, since 3×998812815³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998812811) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 23228184 + ... + 23228226.

It is an arithmetic number, because the mean of its divisors is an integer number (8261352).

Almost surely, 2^998812815 is an apocalyptic number.

998812815 is an abundant number, since it is smaller than the sum of its proper divisors (1380456561).

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

998812815 is a wasteful number, since it uses less digits than its factorization.

998812815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 99 counting only the distinct ones).

The product of its digits is 414720, while the sum is 51.

The square root of 998812815 is about 31603.9999841792. Note that the first 4 decimals coincide. The cubic root of 998812815 is about 999.6041149624.

The spelling of 998812815 in words is "nine hundred ninety-eight million, eight hundred twelve thousand, eight hundred fifteen".