30105812 has 24 divisors (see below), whose sum is σ = 58453920. Its totient is φ = 13451360.

The previous prime is 30105811. The next prime is 30105821. The reversal of 30105812 is 21850103.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30105811) 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, 3203 + ... + 8394.

It is an arithmetic number, because the mean of its divisors is an integer number (2435580).

Almost surely, 2^30105812 is an apocalyptic number.

It is an amenable number.

30105812 is a deficient number, since it is larger than the sum of its proper divisors (28348108).

30105812 is a wasteful number, since it uses less digits than its factorization.

30105812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11671 (or 11669 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 30105812 is about 5486.8763426926. The cubic root of 30105812 is about 311.0881358128.

Adding to 30105812 its reverse (21850103), we get a palindrome (51955915).

The spelling of 30105812 in words is "thirty million, one hundred five thousand, eight hundred twelve".