1229855616 has 384 divisors, whose sum is σ = 4248871200. Its totient is φ = 348733440.

The previous prime is 1229855593. The next prime is 1229855657. The reversal of 1229855616 is 6165589221.

1229855616 is a `hidden beast` number, since 1 + 2 + 2 + 9 + 85 + 561 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7108906 + ... + 7109078.

Almost surely, 2^1229855616 is an apocalyptic number.

1229855616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1229855616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2124435600).

1229855616 is an abundant number, since it is smaller than the sum of its proper divisors (3019015584).

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

1229855616 is a wasteful number, since it uses less digits than its factorization.

1229855616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235 (or 206 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 1229855616 is about 35069.2973411216. The cubic root of 1229855616 is about 1071.3993442084.

The spelling of 1229855616 in words is "one billion, two hundred twenty-nine million, eight hundred fifty-five thousand, six hundred sixteen".