30808919 has 4 divisors (see below), whose sum is σ = 30846480. Its totient is φ = 30771360.

The previous prime is 30808907. The next prime is 30808927. The reversal of 30808919 is 91980803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91980803 = 73 ⋅1260011.

It is a cyclic number.

It is not a de Polignac number, because 30808919 - 2⁸ = 30808663 is a prime.

It is a super-2 number, since 2×30808919² = 1898378979897122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30808949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17522 + ... + 19199.

It is an arithmetic number, because the mean of its divisors is an integer number (7711620).

Almost surely, 2^30808919 is an apocalyptic number.

30808919 is a deficient number, since it is larger than the sum of its proper divisors (37561).

30808919 is an equidigital number, since it uses as much as digits as its factorization.

30808919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37560.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 30808919 is about 5550.5782581637. The cubic root of 30808919 is about 313.4912956603.

The spelling of 30808919 in words is "thirty million, eight hundred eight thousand, nine hundred nineteen".