30155138 has 8 divisors (see below), whose sum is σ = 48712188. Its totient is φ = 13917744.

The previous prime is 30155137. The next prime is 30155141. The reversal of 30155138 is 83155103.

It can be written as a sum of positive squares in 2 ways, for example, as 29997529 + 157609 = 5477^2 + 397^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 1159813 = 30155138 / (3 + 0 + 1 + 5 + 5 + 1 + 3 + 8).

It is not an unprimeable number, because it can be changed into a prime (30155137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 579881 + ... + 579932.

Almost surely, 2^30155138 is an apocalyptic number.

30155138 is a deficient number, since it is larger than the sum of its proper divisors (18557050).

30155138 is a wasteful number, since it uses less digits than its factorization.

30155138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1159828.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 30155138 is about 5491.3694102655. The cubic root of 30155138 is about 311.2579409059.

The spelling of 30155138 in words is "thirty million, one hundred fifty-five thousand, one hundred thirty-eight".