30440520 has 96 divisors (see below), whose sum is σ = 107939520. Its totient is φ = 7378560.

The previous prime is 30440513. The next prime is 30440609. The reversal of 30440520 is 2504403.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 30440493 and 30440502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117 + ... + 7803.

It is an arithmetic number, because the mean of its divisors is an integer number (1124370).

Almost surely, 2^30440520 is an apocalyptic number.

30440520 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 30440520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53969760).

30440520 is an abundant number, since it is smaller than the sum of its proper divisors (77499000).

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

30440520 is a wasteful number, since it uses less digits than its factorization.

30440520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7715 (or 7708 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 30440520 is about 5517.2928144154. The cubic root of 30440520 is about 312.2367532393.

Adding to 30440520 its reverse (2504403), we get a palindrome (32944923).

The spelling of 30440520 in words is "thirty million, four hundred forty thousand, five hundred twenty".