30906198 has 48 divisors (see below), whose sum is σ = 73120320. Its totient is φ = 9756936.

The previous prime is 30906191. The next prime is 30906223. The reversal of 30906198 is 89160903.

30906198 is a `hidden beast` number, since 30 + 9 + 0 + 619 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30906191) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7561 + ... + 10907.

It is an arithmetic number, because the mean of its divisors is an integer number (1523340).

Almost surely, 2^30906198 is an apocalyptic number.

30906198 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 30906198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36560160).

30906198 is an abundant number, since it is smaller than the sum of its proper divisors (42214122).

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

30906198 is a wasteful number, since it uses less digits than its factorization.

30906198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383 (or 3371 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 30906198 is about 5559.3343126673. The cubic root of 30906198 is about 313.8208980375.

The spelling of 30906198 in words is "thirty million, nine hundred six thousand, one hundred ninety-eight".