1213198560 has 480 divisors, whose sum is σ = 5023130112. Its totient is φ = 269982720.

The previous prime is 1213198541. The next prime is 1213198573. The reversal of 1213198560 is 658913121.

1213198560 is a `hidden beast` number, since 1 + 2 + 1 + 3 + 1 + 98 + 560 = 666.

It is a Cunningham number, because it is equal to 34831²-1.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3900805 + ... + 3901115.

Almost surely, 2^1213198560 is an apocalyptic number.

1213198560 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 1213198560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2511565056).

1213198560 is an abundant number, since it is smaller than the sum of its proper divisors (3809931552).

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

1213198560 is a wasteful number, since it uses less digits than its factorization.

1213198560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1213198560 is about 34830.9999856450. Note that the first 4 decimals coincide. The cubic root of 1213198560 is about 1066.5403617808.

The spelling of 1213198560 in words is "one billion, two hundred thirteen million, one hundred ninety-eight thousand, five hundred sixty".