30321040 has 20 divisors (see below), whose sum is σ = 70496604. Its totient is φ = 12128384.

The previous prime is 30321029. The next prime is 30321041. The reversal of 30321040 is 4012303.

It can be written as a sum of positive squares in 2 ways, for example, as 5400976 + 24920064 = 2324^2 + 4992^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 30321040.

It is not an unprimeable number, because it can be changed into a prime (30321041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189427 + ... + 189586.

Almost surely, 2^30321040 is an apocalyptic number.

It is an amenable number.

30321040 is an abundant number, since it is smaller than the sum of its proper divisors (40175564).

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

30321040 is a wasteful number, since it uses less digits than its factorization.

30321040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379026 (or 379020 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 30321040 is about 5506.4543946173. The cubic root of 30321040 is about 311.8277045642.

Adding to 30321040 its reverse (4012303), we get a palindrome (34333343).

The spelling of 30321040 in words is "thirty million, three hundred twenty-one thousand, forty".