1216141478 has 12 divisors (see below), whose sum is σ = 1937831892. Its totient is φ = 572301600.

The previous prime is 1216141471. The next prime is 1216141489. The reversal of 1216141478 is 8741416121.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216141471) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1051448 + ... + 1052603.

It is an arithmetic number, because the mean of its divisors is an integer number (161485991).

Almost surely, 2^1216141478 is an apocalyptic number.

1216141478 is a deficient number, since it is larger than the sum of its proper divisors (721690414).

1216141478 is a wasteful number, since it uses less digits than its factorization.

1216141478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2104087 (or 2104070 counting only the distinct ones).

The product of its digits is 10752, while the sum is 35.

The square root of 1216141478 is about 34873.2200692738. The cubic root of 1216141478 is about 1067.4020526344.

Adding to 1216141478 its reverse (8741416121), we get a palindrome (9957557599).

The spelling of 1216141478 in words is "one billion, two hundred sixteen million, one hundred forty-one thousand, four hundred seventy-eight".