30138556 has 48 divisors (see below), whose sum is σ = 64157184. Its totient is φ = 12108096.

The previous prime is 30138551. The next prime is 30138601. The reversal of 30138556 is 65583103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30138551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33691 + ... + 34573.

It is an arithmetic number, because the mean of its divisors is an integer number (1336608).

Almost surely, 2^30138556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30138556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32078592).

30138556 is an abundant number, since it is smaller than the sum of its proper divisors (34018628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30138556 is a wasteful number, since it uses less digits than its factorization.

30138556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970 (or 968 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 30138556 is about 5489.8593788912. The cubic root of 30138556 is about 311.2008779325.

The spelling of 30138556 in words is "thirty million, one hundred thirty-eight thousand, five hundred fifty-six".