1216160740 has 24 divisors (see below), whose sum is σ = 2688356160. Its totient is φ = 460860768.

The previous prime is 1216160731. The next prime is 1216160753. The reversal of 1216160740 is 470616121.

It is a junction number, because it is equal to n+sod(n) for n = 1216160699 and 1216160708.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1599832 + ... + 1600591.

It is an arithmetic number, because the mean of its divisors is an integer number (112014840).

Almost surely, 2^1216160740 is an apocalyptic number.

1216160740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216160740 is an abundant number, since it is smaller than the sum of its proper divisors (1472195420).

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

1216160740 is a wasteful number, since it uses less digits than its factorization.

1216160740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3200451 (or 3200449 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 1216160740 is about 34873.4962399814. The cubic root of 1216160740 is about 1067.4076879957.

Adding to 1216160740 its reverse (470616121), we get a palindrome (1686776861).

The spelling of 1216160740 in words is "one billion, two hundred sixteen million, one hundred sixty thousand, seven hundred forty".