30725838 has 128 divisors (see below), whose sum is σ = 84188160. Its totient is φ = 8173440.

The previous prime is 30725837. The next prime is 30725839. The reversal of 30725838 is 83852703.

30725838 is a `hidden beast` number, since 3 + 0 + 72 + 583 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (30725837) and next prime (30725839).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30725837) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 177520 + ... + 177692.

It is an arithmetic number, because the mean of its divisors is an integer number (657720).

Almost surely, 2^30725838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30725838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42094080).

30725838 is an abundant number, since it is smaller than the sum of its proper divisors (53462322).

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

30725838 is a wasteful number, since it uses less digits than its factorization.

30725838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 30725838 is about 5543.0892109004. The cubic root of 30725838 is about 313.2092494443.

The spelling of 30725838 in words is "thirty million, seven hundred twenty-five thousand, eight hundred thirty-eight".