978212916 has 48 divisors (see below), whose sum is σ = 2547343680. Its totient is φ = 324626400.

The previous prime is 978212909. The next prime is 978212941. The reversal of 978212916 is 619212879.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4566 + ... + 44466.

It is an arithmetic number, because the mean of its divisors is an integer number (53069660).

Almost surely, 2^978212916 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 978212916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1273671840).

978212916 is an abundant number, since it is smaller than the sum of its proper divisors (1569130764).

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

978212916 is a wasteful number, since it uses less digits than its factorization.

978212916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40141 (or 40133 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 978212916 is about 31276.3955084342. The cubic root of 978212916 is about 992.6842489670.

The spelling of 978212916 in words is "nine hundred seventy-eight million, two hundred twelve thousand, nine hundred sixteen".