1213554320 has 160 divisors (see below), whose sum is σ = 3266040960. Its totient is φ = 414720000.

The previous prime is 1213554283. The next prime is 1213554323. The reversal of 1213554320 is 234553121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1213554320.

It is not an unprimeable number, because it can be changed into a prime (1213554323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3026120 + ... + 3026520.

It is an arithmetic number, because the mean of its divisors is an integer number (20412756).

Almost surely, 2^1213554320 is an apocalyptic number.

1213554320 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 1213554320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1633020480).

1213554320 is an abundant number, since it is smaller than the sum of its proper divisors (2052486640).

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

1213554320 is a wasteful number, since it uses less digits than its factorization.

1213554320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 1213554320 is about 34836.1065562729. The cubic root of 1213554320 is about 1066.6446028422.

The spelling of 1213554320 in words is "one billion, two hundred thirteen million, five hundred fifty-four thousand, three hundred twenty".