30139238 has 8 divisors (see below), whose sum is σ = 46430832. Its totient is φ = 14662296.

The previous prime is 30139237. The next prime is 30139261. The reversal of 30139238 is 83293103.

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

It is a self number, because there is not a number n which added to its sum of digits gives 30139238.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30139237) 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, 203570 + ... + 203717.

It is an arithmetic number, because the mean of its divisors is an integer number (5803854).

Almost surely, 2^30139238 is an apocalyptic number.

30139238 is a deficient number, since it is larger than the sum of its proper divisors (16291594).

30139238 is a wasteful number, since it uses less digits than its factorization.

30139238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407326.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 30139238 is about 5489.9214930634. The cubic root of 30139238 is about 311.2032252845.

The spelling of 30139238 in words is "thirty million, one hundred thirty-nine thousand, two hundred thirty-eight".