30198457 has 2 divisors, whose sum is σ = 30198458. Its totient is φ = 30198456.

The previous prime is 30198451. The next prime is 30198463. The reversal of 30198457 is 75489103.

It is a balanced prime because it is at equal distance from previous prime (30198451) and next prime (30198463).

It can be written as a sum of positive squares in only one way, i.e., 26101881 + 4096576 = 5109^2 + 2024^2 .

It is an emirp because it is prime and its reverse (75489103) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30198457 is a prime.

It is not a weakly prime, because it can be changed into another prime (30198451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15099228 + 15099229.

It is an arithmetic number, because the mean of its divisors is an integer number (15099229).

Almost surely, 2^30198457 is an apocalyptic number.

It is an amenable number.

30198457 is a deficient number, since it is larger than the sum of its proper divisors (1).

30198457 is an equidigital number, since it uses as much as digits as its factorization.

30198457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 30198457 is about 5495.3122750213. The cubic root of 30198457 is about 311.4069142077.

It can be divided in two parts, 3019 and 8457, that added together give a triangular number (11476 = T₁₅₁).

The spelling of 30198457 in words is "thirty million, one hundred ninety-eight thousand, four hundred fifty-seven".