30640189 has 4 divisors (see below), whose sum is σ = 30656124. Its totient is φ = 30624256.

The previous prime is 30640177. The next prime is 30640219. The reversal of 30640189 is 98104603.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98104603 = 17 ⋅5770859.

It can be written as a sum of positive squares in 2 ways, for example, as 10614564 + 20025625 = 3258^2 + 4475^2 .

It is a cyclic number.

It is not a de Polignac number, because 30640189 - 2⁵ = 30640157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30640189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30640889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4612 + ... + 9085.

It is an arithmetic number, because the mean of its divisors is an integer number (7664031).

Almost surely, 2^30640189 is an apocalyptic number.

It is an amenable number.

30640189 is a deficient number, since it is larger than the sum of its proper divisors (15935).

30640189 is a wasteful number, since it uses less digits than its factorization.

30640189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15934.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 30640189 is about 5535.3580733318. The cubic root of 30640189 is about 312.9179525476.

The spelling of 30640189 in words is "thirty million, six hundred forty thousand, one hundred eighty-nine".