1216828415 has 16 divisors (see below), whose sum is σ = 1602723456. Its totient is φ = 879530400.

The previous prime is 1216828411. The next prime is 1216828421. The reversal of 1216828415 is 5148286121.

It is not a de Polignac number, because 1216828415 - 2² = 1216828411 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216828411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58901 + ... + 76830.

It is an arithmetic number, because the mean of its divisors is an integer number (100170216).

Almost surely, 2^1216828415 is an apocalyptic number.

1216828415 is a deficient number, since it is larger than the sum of its proper divisors (385895041).

1216828415 is a wasteful number, since it uses less digits than its factorization.

1216828415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135910.

The product of its digits is 30720, while the sum is 38.

The square root of 1216828415 is about 34883.0677406675. The cubic root of 1216828415 is about 1067.6029886724.

The spelling of 1216828415 in words is "one billion, two hundred sixteen million, eight hundred twenty-eight thousand, four hundred fifteen".