30442140 has 72 divisors (see below), whose sum is σ = 94112928. Its totient is φ = 7962240.

The previous prime is 30442129. The next prime is 30442177. The reversal of 30442140 is 4124403.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7945 + ... + 11135.

It is an arithmetic number, because the mean of its divisors is an integer number (1307124).

Almost surely, 2^30442140 is an apocalyptic number.

30442140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30442140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47056464).

30442140 is an abundant number, since it is smaller than the sum of its proper divisors (63670788).

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

30442140 is a wasteful number, since it uses less digits than its factorization.

30442140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3259 (or 3254 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 30442140 is about 5517.4396235935. The cubic root of 30442140 is about 312.2422920689.

Adding to 30442140 its reverse (4124403), we get a palindrome (34566543).

It can be divided in two parts, 3044 and 2140, that added together give a square (5184 = 72²).

The spelling of 30442140 in words is "thirty million, four hundred forty-two thousand, one hundred forty".