30309240 has 64 divisors (see below), whose sum is σ = 97927200. Its totient is φ = 7460352.

The previous prime is 30309229. The next prime is 30309241. The reversal of 30309240 is 4290303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30309241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8155 + ... + 11274.

Almost surely, 2^30309240 is an apocalyptic number.

30309240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30309240 is an abundant number, since it is smaller than the sum of its proper divisors (67617960).

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

30309240 is a wasteful number, since it uses less digits than its factorization.

30309240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19456 (or 19452 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 30309240 is about 5505.3828204767. The cubic root of 30309240 is about 311.7872481205.

Adding to 30309240 its reverse (4290303), we get a palindrome (34599543).

The spelling of 30309240 in words is "thirty million, three hundred nine thousand, two hundred forty".