1216452140 has 24 divisors (see below), whose sum is σ = 2565812592. Its totient is φ = 484435520.

The previous prime is 1216452137. The next prime is 1216452169. The reversal of 1216452140 is 412546121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129431 + ... + 138510.

It is an arithmetic number, because the mean of its divisors is an integer number (106908858).

Almost surely, 2^1216452140 is an apocalyptic number.

1216452140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216452140 is an abundant number, since it is smaller than the sum of its proper divisors (1349360452).

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

1216452140 is a wasteful number, since it uses less digits than its factorization.

1216452140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268177 (or 268175 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1216452140 is about 34877.6739476703. The cubic root of 1216452140 is about 1067.4929337889.

Adding to 1216452140 its reverse (412546121), we get a palindrome (1628998261).

The spelling of 1216452140 in words is "one billion, two hundred sixteen million, four hundred fifty-two thousand, one hundred forty".