30121506 has 48 divisors (see below), whose sum is σ = 67223520. Its totient is φ = 9744000.

The previous prime is 30121499. The next prime is 30121523. The reversal of 30121506 is 60512103.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 119881 + ... + 120131.

It is an arithmetic number, because the mean of its divisors is an integer number (1400490).

Almost surely, 2^30121506 is an apocalyptic number.

30121506 is an abundant number, since it is smaller than the sum of its proper divisors (37102014).

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

30121506 is a wasteful number, since it uses less digits than its factorization.

30121506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 30121506 is about 5488.3062961172. The cubic root of 30121506 is about 311.1421826204.

Adding to 30121506 its reverse (60512103), we get a palindrome (90633609).

The spelling of 30121506 in words is "thirty million, one hundred twenty-one thousand, five hundred six".