30243240 has 128 divisors (see below), whose sum is σ = 103420800. Its totient is φ = 7856640.

The previous prime is 30243211. The next prime is 30243247. The reversal of 30243240 is 4234203.

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

It is not an unprimeable number, because it can be changed into a prime (30243247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43939 + ... + 44621.

It is an arithmetic number, because the mean of its divisors is an integer number (807975).

Almost surely, 2^30243240 is an apocalyptic number.

30243240 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 30243240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51710400).

30243240 is an abundant number, since it is smaller than the sum of its proper divisors (73177560).

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

30243240 is a wasteful number, since it uses less digits than its factorization.

30243240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744 (or 734 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 30243240 is about 5499.3854202083. The cubic root of 30243240 is about 311.5607724868.

Adding to 30243240 its reverse (4234203), we get a palindrome (34477443).

The spelling of 30243240 in words is "thirty million, two hundred forty-three thousand, two hundred forty".