30181340 has 48 divisors (see below), whose sum is σ = 72875712. Its totient is φ = 10285056.

The previous prime is 30181303. The next prime is 30181351. The reversal of 30181340 is 4318103.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26462 + ... + 27578.

It is an arithmetic number, because the mean of its divisors is an integer number (1518244).

Almost surely, 2^30181340 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 30181340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36437856).

30181340 is an abundant number, since it is smaller than the sum of its proper divisors (42694372).

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

30181340 is a wasteful number, since it uses less digits than its factorization.

30181340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1326 (or 1324 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 30181340 is about 5493.7546359480. The cubic root of 30181340 is about 311.3480661725.

Adding to 30181340 its reverse (4318103), we get a palindrome (34499443).

The spelling of 30181340 in words is "thirty million, one hundred eighty-one thousand, three hundred forty".