30840205 has 16 divisors (see below), whose sum is σ = 40497408. Its totient is φ = 22360000.

The previous prime is 30840163. The next prime is 30840221. The reversal of 30840205 is 50204803.

It is not a de Polignac number, because 30840205 - 2¹⁵ = 30807437 is a prime.

It is a super-2 number, since 2×30840205² = 1902236488884050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23055 + ... + 24355.

It is an arithmetic number, because the mean of its divisors is an integer number (2531088).

Almost surely, 2^30840205 is an apocalyptic number.

It is an amenable number.

30840205 is a deficient number, since it is larger than the sum of its proper divisors (9657203).

30840205 is a wasteful number, since it uses less digits than its factorization.

30840205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1748.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 30840205 is about 5553.3958079719. The cubic root of 30840205 is about 313.5973750138.

The spelling of 30840205 in words is "thirty million, eight hundred forty thousand, two hundred five".