978198450 has 48 divisors (see below), whose sum is σ = 2445081600. Its totient is φ = 258793920.

The previous prime is 978198437. The next prime is 978198457. The reversal of 978198450 is 54891879.

It is a junction number, because it is equal to n+sod(n) for n = 978198393 and 978198402.

It is not an unprimeable number, because it can be changed into a prime (978198457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6625 + ... + 44724.

It is an arithmetic number, because the mean of its divisors is an integer number (50939200).

Almost surely, 2^978198450 is an apocalyptic number.

978198450 is an abundant number, since it is smaller than the sum of its proper divisors (1466883150).

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

978198450 is a wasteful number, since it uses less digits than its factorization.

978198450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51491 (or 51486 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 51.

The square root of 978198450 is about 31276.1642469149. The cubic root of 978198450 is about 992.6793556079.

The spelling of 978198450 in words is "nine hundred seventy-eight million, one hundred ninety-eight thousand, four hundred fifty".