1216429308 has 36 divisors (see below), whose sum is σ = 3075960888. Its totient is φ = 405331680.

The previous prime is 1216429307. The next prime is 1216429321. The reversal of 1216429308 is 8039246121.

1216429308 is a `hidden beast` number, since 1 + 2 + 1 + 642 + 9 + 3 + 0 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1216429308² = 2959400522722717728, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216429301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 155335 + ... + 162977.

It is an arithmetic number, because the mean of its divisors is an integer number (85443358).

Almost surely, 2^1216429308 is an apocalyptic number.

1216429308 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1216429308 is an abundant number, since it is smaller than the sum of its proper divisors (1859531580).

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

1216429308 is a wasteful number, since it uses less digits than its factorization.

1216429308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12074 (or 12069 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1216429308 is about 34877.3466307287. The cubic root of 1216429308 is about 1067.4862550357.

The spelling of 1216429308 in words is "one billion, two hundred sixteen million, four hundred twenty-nine thousand, three hundred eight".