1216322415 has 48 divisors (see below), whose sum is σ = 2628527616. Its totient is φ = 505483200.

The previous prime is 1216322377. The next prime is 1216322509. The reversal of 1216322415 is 5142236121.

1216322415 is a `hidden beast` number, since 1 + 2 + 1 + 632 + 24 + 1 + 5 = 666.

It is not a de Polignac number, because 1216322415 - 2⁶ = 1216322351 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 172051 + ... + 178980.

It is an arithmetic number, because the mean of its divisors is an integer number (54760992).

Almost surely, 2^1216322415 is an apocalyptic number.

1216322415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1216322415 is an abundant number, since it is smaller than the sum of its proper divisors (1412205201).

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

1216322415 is a wasteful number, since it uses less digits than its factorization.

1216322415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351060 (or 351057 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 1216322415 is about 34875.8141840445. The cubic root of 1216322415 is about 1067.4549858804.

Adding to 1216322415 its reverse (5142236121), we get a palindrome (6358558536).

The spelling of 1216322415 in words is "one billion, two hundred sixteen million, three hundred twenty-two thousand, four hundred fifteen".