30185138 has 8 divisors (see below), whose sum is σ = 45349632. Its totient is φ = 15068596.

The previous prime is 30185137. The next prime is 30185159. The reversal of 30185138 is 83158103.

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

It is a super-2 number, since 2×30185138² = 1822285112158088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30185138.

It is not an unprimeable number, because it can be changed into a prime (30185137) 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 3 ways as a sum of consecutive naturals, for example, 10370 + ... + 12957.

It is an arithmetic number, because the mean of its divisors is an integer number (5668704).

Almost surely, 2^30185138 is an apocalyptic number.

30185138 is a deficient number, since it is larger than the sum of its proper divisors (15164494).

30185138 is a wasteful number, since it uses less digits than its factorization.

30185138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23976.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 30185138 is about 5494.1002903114. The cubic root of 30185138 is about 311.3611255701.

The spelling of 30185138 in words is "thirty million, one hundred eighty-five thousand, one hundred thirty-eight".