1216425808 has 40 divisors (see below), whose sum is σ = 2549399328. Its totient is φ = 558932352.

The previous prime is 1216425757. The next prime is 1216425823. The reversal of 1216425808 is 8085246121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34335 + ... + 60097.

Almost surely, 2^1216425808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216425808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1274699664).

1216425808 is an abundant number, since it is smaller than the sum of its proper divisors (1332973520).

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

1216425808 is a wasteful number, since it uses less digits than its factorization.

1216425808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26011 (or 26005 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 1216425808 is about 34877.2964548573. The cubic root of 1216425808 is about 1067.4852312180.

The spelling of 1216425808 in words is "one billion, two hundred sixteen million, four hundred twenty-five thousand, eight hundred eight".