30181242 has 64 divisors (see below), whose sum is σ = 74962944. Its totient is φ = 7888320.

The previous prime is 30181241. The next prime is 30181297. The reversal of 30181242 is 24218103.

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

It is not an unprimeable number, because it can be changed into a prime (30181241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91017 + ... + 91347.

It is an arithmetic number, because the mean of its divisors is an integer number (1171296).

Almost surely, 2^30181242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30181242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37481472).

30181242 is an abundant number, since it is smaller than the sum of its proper divisors (44781702).

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

30181242 is a wasteful number, since it uses less digits than its factorization.

30181242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 30181242 is about 5493.7457167219. The cubic root of 30181242 is about 311.3477291857.

Adding to 30181242 its reverse (24218103), we get a palindrome (54399345).

The spelling of 30181242 in words is "thirty million, one hundred eighty-one thousand, two hundred forty-two".