1639216908 has 144 divisors (see below), whose sum is σ = 5089803264. Its totient is φ = 434142720.

The previous prime is 1639216903. The next prime is 1639216933. The reversal of 1639216908 is 8096129361.

It is a happy number.

1639216908 is a `hidden beast` number, since 1 + 639 + 2 + 1 + 6 + 9 + 0 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (1639216903) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 284173 + ... + 289883.

It is an arithmetic number, because the mean of its divisors is an integer number (35345856).

Almost surely, 2^1639216908 is an apocalyptic number.

1639216908 is a gapful number since it is divisible by the number (18) 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 1639216908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2544901632).

1639216908 is an abundant number, since it is smaller than the sum of its proper divisors (3450586356).

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

1639216908 is a wasteful number, since it uses less digits than its factorization.

1639216908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5812 (or 5807 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 1639216908 is about 40487.2437688712. The cubic root of 1639216908 is about 1179.0859789633.

It can be divided in two parts, 163 and 9216908, that added together give a triangular number (9217071 = T₄₂₉₃).

The spelling of 1639216908 in words is "one billion, six hundred thirty-nine million, two hundred sixteen thousand, nine hundred eight".