30313440 has 120 divisors (see below), whose sum is σ = 107026920. Its totient is φ = 8080128.

The previous prime is 30313429. The next prime is 30313447. The reversal of 30313440 is 4431303.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30313447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11791 + ... + 14129.

It is an arithmetic number, because the mean of its divisors is an integer number (891891).

Almost surely, 2^30313440 is an apocalyptic number.

30313440 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 30313440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53513460).

30313440 is an abundant number, since it is smaller than the sum of its proper divisors (76713480).

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

30313440 is a wasteful number, since it uses less digits than its factorization.

30313440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366 (or 2349 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 30313440 is about 5505.7642521270. The cubic root of 30313440 is about 311.8016490750.

Adding to 30313440 its reverse (4431303), we get a palindrome (34744743).

The spelling of 30313440 in words is "thirty million, three hundred thirteen thousand, four hundred forty".