30123155 has 8 divisors (see below), whose sum is σ = 36229632. Its totient is φ = 24043968.

The previous prime is 30123139. The next prime is 30123157. The reversal of 30123155 is 55132103.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 30123155 - 2⁴ = 30123139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30123157) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4307 + ... + 8876.

It is an arithmetic number, because the mean of its divisors is an integer number (4528704).

Almost surely, 2^30123155 is an apocalyptic number.

30123155 is a deficient number, since it is larger than the sum of its proper divisors (6106477).

30123155 is a wasteful number, since it uses less digits than its factorization.

30123155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13645.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 30123155 is about 5488.4565225571. The cubic root of 30123155 is about 311.1478603367.

Adding to 30123155 its reverse (55132103), we get a palindrome (85255258).

The spelling of 30123155 in words is "thirty million, one hundred twenty-three thousand, one hundred fifty-five".