30385840 has 40 divisors (see below), whose sum is σ = 71714160. Its totient is φ = 11970816.

The previous prime is 30385819. The next prime is 30385841. The reversal of 30385840 is 4858303.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (30385841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2526 + ... + 8194.

It is an arithmetic number, because the mean of its divisors is an integer number (1792854).

Almost surely, 2^30385840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30385840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35857080).

30385840 is an abundant number, since it is smaller than the sum of its proper divisors (41328320).

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

30385840 is a wasteful number, since it uses less digits than its factorization.

30385840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5749 (or 5743 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 30385840 is about 5512.3352583093. The cubic root of 30385840 is about 312.0496852716.

The spelling of 30385840 in words is "thirty million, three hundred eighty-five thousand, eight hundred forty".