1921612008 has 32 divisors (see below), whose sum is σ = 4846550400. Its totient is φ = 634867968.

The previous prime is 1921612003. The next prime is 1921612009. The reversal of 1921612008 is 8002161291.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1921612003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351568 + ... + 356991.

It is an arithmetic number, because the mean of its divisors is an integer number (151454700).

Almost surely, 2^1921612008 is an apocalyptic number.

It is an amenable number.

1921612008 is an abundant number, since it is smaller than the sum of its proper divisors (2924938392).

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

1921612008 is a wasteful number, since it uses less digits than its factorization.

1921612008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708681 (or 708677 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 1921612008 is about 43836.1951816076. The cubic root of 1921612008 is about 1243.2407442227.

Adding to 1921612008 its reverse (8002161291), we get a palindrome (9923773299).

The spelling of 1921612008 in words is "one billion, nine hundred twenty-one million, six hundred twelve thousand, eight".