1216816458 has 32 divisors (see below), whose sum is σ = 2859095232. Its totient is φ = 340368000.

The previous prime is 1216816441. The next prime is 1216816459. The reversal of 1216816458 is 8546186121.

It is not an unprimeable number, because it can be changed into a prime (1216816459) 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, 708243 + ... + 709958.

It is an arithmetic number, because the mean of its divisors is an integer number (89346726).

Almost surely, 2^1216816458 is an apocalyptic number.

1216816458 is an abundant number, since it is smaller than the sum of its proper divisors (1642278774).

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

1216816458 is a wasteful number, since it uses less digits than its factorization.

1216816458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1418230.

The product of its digits is 92160, while the sum is 42.

The square root of 1216816458 is about 34882.8963533707. The cubic root of 1216816458 is about 1067.5994917755.

The spelling of 1216816458 in words is "one billion, two hundred sixteen million, eight hundred sixteen thousand, four hundred fifty-eight".