30905253 has 16 divisors (see below), whose sum is σ = 46234240. Its totient is φ = 20401632.

The previous prime is 30905243. The next prime is 30905257. The reversal of 30905253 is 35250903.

It is not a de Polignac number, because 30905253 - 2⁵ = 30905221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30905257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2776 + ... + 8337.

It is an arithmetic number, because the mean of its divisors is an integer number (2889640).

Almost surely, 2^30905253 is an apocalyptic number.

It is an amenable number.

30905253 is a deficient number, since it is larger than the sum of its proper divisors (15328987).

30905253 is a wasteful number, since it uses less digits than its factorization.

30905253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11225 (or 11219 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 27.

The square root of 30905253 is about 5559.2493198273. The cubic root of 30905253 is about 313.8176995014.

The spelling of 30905253 in words is "thirty million, nine hundred five thousand, two hundred fifty-three".