9780418816 has 81 divisors (see below), whose sum is σ = 22735749771. Its totient is φ = 4186861056.

The previous prime is 9780418789. The next prime is 9780418819. The reversal of 9780418816 is 6188140879.

It is a happy number.

The square root of 9780418816 is 98896.

It is a perfect power (a square), and thus also a powerful number.

It is not an unprimeable number, because it can be changed into a prime (9780418819) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11075911 + ... + 11076793.

Almost surely, 2^9780418816 is an apocalyptic number.

9780418816 is the 98896-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9780418816

9780418816 is an abundant number, since it is smaller than the sum of its proper divisors (12955330955).

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

9780418816 is an frugal number, since it uses more digits than its factorization.

9780418816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796 (or 892 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 52.

The cubic root of 9780418816 is about 2138.5487304102.

The spelling of 9780418816 in words is "nine billion, seven hundred eighty million, four hundred eighteen thousand, eight hundred sixteen".