30135440 has 40 divisors (see below), whose sum is σ = 70525248. Its totient is φ = 11975040.

The previous prime is 30135439. The next prime is 30135467. The reversal of 30135440 is 4453103.

It is a tau number, because it is divible by the number of its divisors (40).

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11885 + ... + 14195.

Almost surely, 2^30135440 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 30135440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35262624).

30135440 is an abundant number, since it is smaller than the sum of its proper divisors (40389808).

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

30135440 is a wasteful number, since it uses less digits than its factorization.

30135440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2487 (or 2481 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 30135440 is about 5489.5755755796. The cubic root of 30135440 is about 311.1901526304.

Adding to 30135440 its reverse (4453103), we get a palindrome (34588543).

The spelling of 30135440 in words is "thirty million, one hundred thirty-five thousand, four hundred forty".