30939240 has 64 divisors (see below), whose sum is σ = 95823360. Its totient is φ = 7983360.

The previous prime is 30939221. The next prime is 30939241. The reversal of 30939240 is 4293903.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 30939198 and 30939207.

It is not an unprimeable number, because it can be changed into a prime (30939241) 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, 439 + ... + 7878.

It is an arithmetic number, because the mean of its divisors is an integer number (1497240).

Almost surely, 2^30939240 is an apocalyptic number.

30939240 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 30939240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47911680).

30939240 is an abundant number, since it is smaller than the sum of its proper divisors (64884120).

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

30939240 is a wasteful number, since it uses less digits than its factorization.

30939240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8362 (or 8358 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 30939240 is about 5562.3052774906. The cubic root of 30939240 is about 313.9326941356.

The spelling of 30939240 in words is "thirty million, nine hundred thirty-nine thousand, two hundred forty".