30189820 has 12 divisors (see below), whose sum is σ = 63398664. Its totient is φ = 12075920.

The previous prime is 30189811. The next prime is 30189821. The reversal of 30189820 is 2898103.

It is a super-2 number, since 2×30189820² = 1822850463264800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30189821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 754726 + ... + 754765.

It is an arithmetic number, because the mean of its divisors is an integer number (5283222).

Almost surely, 2^30189820 is an apocalyptic number.

It is an amenable number.

30189820 is an abundant number, since it is smaller than the sum of its proper divisors (33208844).

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

30189820 is a wasteful number, since it uses less digits than its factorization.

30189820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509500 (or 1509498 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 30189820 is about 5494.5263672131. The cubic root of 30189820 is about 311.3772230883.

The spelling of 30189820 in words is "thirty million, one hundred eighty-nine thousand, eight hundred twenty".