998981215 has 16 divisors (see below), whose sum is σ = 1221674400. Its totient is φ = 783978112.

The previous prime is 998981161. The next prime is 998981219. The reversal of 998981215 is 512189899.

It is a cyclic number.

It is not a de Polignac number, because 998981215 - 2¹¹ = 998979167 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998981219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146829 + ... + 153481.

It is an arithmetic number, because the mean of its divisors is an integer number (76354650).

Almost surely, 2^998981215 is an apocalyptic number.

998981215 is a deficient number, since it is larger than the sum of its proper divisors (222693185).

998981215 is a wasteful number, since it uses less digits than its factorization.

998981215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7226.

The product of its digits is 466560, while the sum is 52.

The square root of 998981215 is about 31606.6640916121. The cubic root of 998981215 is about 999.6602896099.

It can be divided in two parts, 9989 and 81215, that added together give a square (91204 = 302²).

The spelling of 998981215 in words is "nine hundred ninety-eight million, nine hundred eighty-one thousand, two hundred fifteen".