1198897920 has 216 divisors, whose sum is σ = 4525636752. Its totient is φ = 290611200.

The previous prime is 1198897873. The next prime is 1198897927. The reversal of 1198897920 is 297988911.

It is not an unprimeable number, because it can be changed into a prime (1198897927) 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, 121990 + ... + 131450.

It is an arithmetic number, because the mean of its divisors is an integer number (20952022).

Almost surely, 2^1198897920 is an apocalyptic number.

1198897920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1198897920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2262818376).

1198897920 is an abundant number, since it is smaller than the sum of its proper divisors (3326738832).

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

1198897920 is a wasteful number, since it uses less digits than its factorization.

1198897920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9499 (or 9482 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 54.

The square root of 1198897920 is about 34625.1053428000. The cubic root of 1198897920 is about 1062.3331543320. Note that the first 3 decimals are identical.

Subtracting from 1198897920 its reverse (297988911), we obtain a palindrome (900909009).

The spelling of 1198897920 in words is "one billion, one hundred ninety-eight million, eight hundred ninety-seven thousand, nine hundred twenty".