30493857 has 4 divisors (see below), whose sum is σ = 40658480. Its totient is φ = 20329236.

The previous prime is 30493831. The next prime is 30493867. The reversal of 30493857 is 75839403.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 30493857 - 2⁸ = 30493601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30493817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5082307 + ... + 5082312.

It is an arithmetic number, because the mean of its divisors is an integer number (10164620).

Almost surely, 2^30493857 is an apocalyptic number.

It is an amenable number.

30493857 is a deficient number, since it is larger than the sum of its proper divisors (10164623).

30493857 is a wasteful number, since it uses less digits than its factorization.

30493857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10164622.

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 30493857 is about 5522.1243194988. The cubic root of 30493857 is about 312.4190109056.

The spelling of 30493857 in words is "thirty million, four hundred ninety-three thousand, eight hundred fifty-seven".