30120257 has 4 divisors (see below), whose sum is σ = 30934356. Its totient is φ = 29306160.

The previous prime is 30120239. The next prime is 30120289. The reversal of 30120257 is 75202103.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16289296 + 13830961 = 4036^2 + 3719^2 .

It is a cyclic number.

It is not a de Polignac number, because 30120257 - 2¹⁰ = 30119233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30120217) 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, 406994 + ... + 407067.

It is an arithmetic number, because the mean of its divisors is an integer number (7733589).

Almost surely, 2^30120257 is an apocalyptic number.

30120257 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

30120257 is a deficient number, since it is larger than the sum of its proper divisors (814099).

30120257 is an equidigital number, since it uses as much as digits as its factorization.

30120257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814098.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 30120257 is about 5488.1925075566. The cubic root of 30120257 is about 311.1378820170.

The spelling of 30120257 in words is "thirty million, one hundred twenty thousand, two hundred fifty-seven".