30231138 has 72 divisors (see below), whose sum is σ = 73354896. Its totient is φ = 8280720.

The previous prime is 30231133. The next prime is 30231181. The reversal of 30231138 is 83113203.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30231133) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 282481 + ... + 282587.

It is an arithmetic number, because the mean of its divisors is an integer number (1018818).

Almost surely, 2^30231138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30231138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36677448).

30231138 is an abundant number, since it is smaller than the sum of its proper divisors (43123758).

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

30231138 is a wasteful number, since it uses less digits than its factorization.

30231138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 30231138 is about 5498.2850053448. The cubic root of 30231138 is about 311.5192093528.

The spelling of 30231138 in words is "thirty million, two hundred thirty-one thousand, one hundred thirty-eight".