1216052440 has 32 divisors (see below), whose sum is σ = 2880126000. Its totient is φ = 460819584.

The previous prime is 1216052401. The next prime is 1216052441. The reversal of 1216052440 is 442506121.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216052441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 799275 + ... + 800794.

Almost surely, 2^1216052440 is an apocalyptic number.

1216052440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216052440 is an abundant number, since it is smaller than the sum of its proper divisors (1664073560).

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

1216052440 is a wasteful number, since it uses less digits than its factorization.

1216052440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600099 (or 1600095 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1216052440 is about 34871.9434502868. The cubic root of 1216052440 is about 1067.3760025777.

Adding to 1216052440 its reverse (442506121), we get a palindrome (1658558561).

The spelling of 1216052440 in words is "one billion, two hundred sixteen million, fifty-two thousand, four hundred forty".