30470440 has 128 divisors (see below), whose sum is σ = 92171520. Its totient is φ = 8755200.

The previous prime is 30470393. The next prime is 30470449. The reversal of 30470440 is 4407403.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (30470449) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 39660 + ... + 40420.

It is an arithmetic number, because the mean of its divisors is an integer number (720090).

Almost surely, 2^30470440 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 30470440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46085760).

30470440 is an abundant number, since it is smaller than the sum of its proper divisors (61701080).

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

30470440 is a wasteful number, since it uses less digits than its factorization.

30470440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803 (or 799 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 22.

The square root of 30470440 is about 5520.0036231872. The cubic root of 30470440 is about 312.3390189532.

Adding to 30470440 its reverse (4407403), we get a palindrome (34877843).

The spelling of 30470440 in words is "thirty million, four hundred seventy thousand, four hundred forty".