978217396 has 72 divisors (see below), whose sum is σ = 1940449784. Its totient is φ = 428613120.

The previous prime is 978217381. The next prime is 978217397. The reversal of 978217396 is 693712879.

It can be written as a sum of positive squares in 12 ways, for example, as 202037796 + 776179600 = 14214^2 + 27860^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978217397) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5404426 + ... + 5404606.

Almost surely, 2^978217396 is an apocalyptic number.

It is an amenable number.

978217396 is a deficient number, since it is larger than the sum of its proper divisors (962232388).

978217396 is a wasteful number, since it uses less digits than its factorization.

978217396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 286 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 52.

The square root of 978217396 is about 31276.4671278583. The cubic root of 978217396 is about 992.6857643899.

The spelling of 978217396 in words is "nine hundred seventy-eight million, two hundred seventeen thousand, three hundred ninety-six".