30121530 has 32 divisors (see below), whose sum is σ = 73168704. Its totient is φ = 7934976.

The previous prime is 30121529. The next prime is 30121547. The reversal of 30121530 is 3512103.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3559 + ... + 8538.

It is an arithmetic number, because the mean of its divisors is an integer number (2286522).

Almost surely, 2^30121530 is an apocalyptic number.

30121530 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

30121530 is an abundant number, since it is smaller than the sum of its proper divisors (43047174).

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

30121530 is a wasteful number, since it uses less digits than its factorization.

30121530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12190.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 30121530 is about 5488.3084825837. The cubic root of 30121530 is about 311.1422652570.

Adding to 30121530 its reverse (3512103), we get a palindrome (33633633).

The spelling of 30121530 in words is "thirty million, one hundred twenty-one thousand, five hundred thirty".