30189018 has 16 divisors (see below), whose sum is σ = 63003456. Its totient is φ = 9625440.

The previous prime is 30189017. The next prime is 30189023. The reversal of 30189018 is 81098103.

It is a super-2 number, since 2×30189018² = 1822753615608648, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (30189013) 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, 109243 + ... + 109518.

It is an arithmetic number, because the mean of its divisors is an integer number (3937716).

Almost surely, 2^30189018 is an apocalyptic number.

30189018 is an abundant number, since it is smaller than the sum of its proper divisors (32814438).

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

30189018 is a wasteful number, since it uses less digits than its factorization.

30189018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218789.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 30189018 is about 5494.4533850056. The cubic root of 30189018 is about 311.3744657931.

The spelling of 30189018 in words is "thirty million, one hundred eighty-nine thousand, eighteen".