30040440 has 64 divisors (see below), whose sum is σ = 91670400. Its totient is φ = 7873152.

The previous prime is 30040429. The next prime is 30040441. The reversal of 30040440 is 4404003.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30040441) 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, 4959 + ... + 9201.

It is an arithmetic number, because the mean of its divisors is an integer number (1432350).

Almost surely, 2^30040440 is an apocalyptic number.

30040440 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 30040440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45835200).

30040440 is an abundant number, since it is smaller than the sum of its proper divisors (61629960).

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

30040440 is a wasteful number, since it uses less digits than its factorization.

30040440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4316 (or 4312 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 30040440 is about 5480.9159818410. The cubic root of 30040440 is about 310.8628062211.

Adding to 30040440 its reverse (4404003), we get a palindrome (34444443).

The spelling of 30040440 in words is "thirty million, forty thousand, four hundred forty".