30381905 has 4 divisors (see below), whose sum is σ = 36458292. Its totient is φ = 24305520.

The previous prime is 30381863. The next prime is 30381917. The reversal of 30381905 is 50918303.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50918303 = 73 ⋅697511.

It can be written as a sum of positive squares in 2 ways, for example, as 6635776 + 23746129 = 2576^2 + 4873^2 .

It is not a de Polignac number, because 30381905 - 2⁸ = 30381649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3038186 + ... + 3038195.

It is an arithmetic number, because the mean of its divisors is an integer number (9114573).

Almost surely, 2^30381905 is an apocalyptic number.

It is an amenable number.

30381905 is a deficient number, since it is larger than the sum of its proper divisors (6076387).

30381905 is an equidigital number, since it uses as much as digits as its factorization.

30381905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6076386.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 30381905 is about 5511.9783199864. The cubic root of 30381905 is about 312.0362144299.

The spelling of 30381905 in words is "thirty million, three hundred eighty-one thousand, nine hundred five".