1215897320 has 64 divisors (see below), whose sum is σ = 2988878400. Its totient is φ = 441492480.

The previous prime is 1215897313. The next prime is 1215897337. The reversal of 1215897320 is 237985121.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376352 + ... + 379568.

It is an arithmetic number, because the mean of its divisors is an integer number (46701225).

Almost surely, 2^1215897320 is an apocalyptic number.

1215897320 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 1215897320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1494439200).

1215897320 is an abundant number, since it is smaller than the sum of its proper divisors (1772981080).

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

1215897320 is a wasteful number, since it uses less digits than its factorization.

1215897320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4098 (or 4094 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 1215897320 is about 34869.7192417719. The cubic root of 1215897320 is about 1067.3306157175.

The spelling of 1215897320 in words is "one billion, two hundred fifteen million, eight hundred ninety-seven thousand, three hundred twenty".