30191900 has 54 divisors (see below), whose sum is σ = 68042520. Its totient is φ = 11627840.

The previous prime is 30191899. The next prime is 30191911. The reversal of 30191900 is 919103.

It is a super-2 number, since 2×30191900² = 1823101651220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 83921 + ... + 84279.

Almost surely, 2^30191900 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 30191900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34021260).

30191900 is an abundant number, since it is smaller than the sum of its proper divisors (37850620).

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

30191900 is a wasteful number, since it uses less digits than its factorization.

30191900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 30191900 is about 5494.7156432340. The cubic root of 30191900 is about 311.3843739508.

The spelling of 30191900 in words is "thirty million, one hundred ninety-one thousand, nine hundred".