30157 has 4 divisors (see below), whose sum is σ = 30780. Its totient is φ = 29536.

The previous prime is 30139. The next prime is 30161. The reversal of 30157 is 75103.

30157 is nontrivially palindromic in base 12.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75103 = 7 ⋅10729.

It can be written as a sum of positive squares in 2 ways, for example, as 12996 + 17161 = 114^2 + 131^2 .

It is a cyclic number.

It is not a de Polignac number, because 30157 - 2⁷ = 30029 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 30157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30137) 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, 232 + ... + 337.

It is an arithmetic number, because the mean of its divisors is an integer number (7695).

2³⁰¹⁵⁷ is an apocalyptic number.

It is an amenable number.

30157 is a deficient number, since it is larger than the sum of its proper divisors (623).

30157 is an equidigital number, since it uses as much as digits as its factorization.

30157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622.

The product of its (nonzero) digits is 105, while the sum is 16.

The square root of 30157 is about 173.6577093019. The cubic root of 30157 is about 31.1264347226.

The spelling of 30157 in words is "thirty thousand, one hundred fifty-seven".