18930155 has 8 divisors (see below), whose sum is σ = 22890384. Its totient is φ = 15028000.

The previous prime is 18930133. The next prime is 18930161. The reversal of 18930155 is 55103981.

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

It is not a de Polignac number, because 18930155 - 2⁸ = 18929899 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 13796 + ... + 15105.

It is an arithmetic number, because the mean of its divisors is an integer number (2861298).

Almost surely, 2^18930155 is an apocalyptic number.

18930155 is a deficient number, since it is larger than the sum of its proper divisors (3960229).

18930155 is a wasteful number, since it uses less digits than its factorization.

18930155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29037.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 18930155 is about 4350.8797960872. The cubic root of 18930155 is about 266.5127905654.

The spelling of 18930155 in words is "eighteen million, nine hundred thirty thousand, one hundred fifty-five".