1216256044 has 12 divisors (see below), whose sum is σ = 2240471800. Its totient is φ = 576121248.

The previous prime is 1216256029. The next prime is 1216256047. The reversal of 1216256044 is 4406526121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1216255997 and 1216256015.

It is not an unprimeable number, because it can be changed into a prime (1216256047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8001609 + ... + 8001760.

Almost surely, 2^1216256044 is an apocalyptic number.

It is an amenable number.

1216256044 is a deficient number, since it is larger than the sum of its proper divisors (1024215756).

1216256044 is a wasteful number, since it uses less digits than its factorization.

1216256044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16003392 (or 16003390 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1216256044 is about 34874.8626377223. The cubic root of 1216256044 is about 1067.4355696076.

The spelling of 1216256044 in words is "one billion, two hundred sixteen million, two hundred fifty-six thousand, forty-four".