30000557 has 4 divisors (see below), whose sum is σ = 30011520. Its totient is φ = 29989596.

The previous prime is 30000521. The next prime is 30000571. The reversal of 30000557 is 75500003.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 75500003 = 199 ⋅379397.

It is a cyclic number.

It is not a de Polignac number, because 30000557 - 2⁶ = 30000493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30000457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2438 + ... + 8120.

It is an arithmetic number, because the mean of its divisors is an integer number (7502880).

Almost surely, 2^30000557 is an apocalyptic number.

It is an amenable number.

30000557 is a deficient number, since it is larger than the sum of its proper divisors (10963).

30000557 is an equidigital number, since it uses as much as digits as its factorization.

30000557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10962.

The product of its (nonzero) digits is 525, while the sum is 20.

The square root of 30000557 is about 5477.2764217264. The cubic root of 30000557 is about 310.7251736152.

The spelling of 30000557 in words is "thirty million, five hundred fifty-seven", and thus it is an aban number.