1216400116 has 24 divisors (see below), whose sum is σ = 2285672256. Its totient is φ = 564359040.

The previous prime is 1216400093. The next prime is 1216400179. The reversal of 1216400116 is 6110046121.

It is a congruent number.

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, 121146 + ... + 130801.

It is an arithmetic number, because the mean of its divisors is an integer number (95236344).

Almost surely, 2^1216400116 is an apocalyptic number.

It is an amenable number.

1216400116 is a deficient number, since it is larger than the sum of its proper divisors (1069272140).

1216400116 is a wasteful number, since it uses less digits than its factorization.

1216400116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252039 (or 252037 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1216400116 is about 34876.9281330796. The cubic root of 1216400116 is about 1067.4777157511.

Adding to 1216400116 its reverse (6110046121), we get a palindrome (7326446237).

The spelling of 1216400116 in words is "one billion, two hundred sixteen million, four hundred thousand, one hundred sixteen".