18303157 has 4 divisors (see below), whose sum is σ = 18613440. Its totient is φ = 17992876.

The previous prime is 18303151. The next prime is 18303199. The reversal of 18303157 is 75130381.

18303157 = T₇₅₈ + T₇₅₉ + ... + T₈₁₆.

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 an emirpimes, since its reverse is a distinct semiprime: 75130381 = 941 ⋅79841.

It is not a de Polignac number, because 18303157 - 2³ = 18303149 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 (18303151) 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, 155053 + ... + 155170.

It is an arithmetic number, because the mean of its divisors is an integer number (4653360).

Almost surely, 2^18303157 is an apocalyptic number.

It is an amenable number.

18303157 is a deficient number, since it is larger than the sum of its proper divisors (310283).

18303157 is an equidigital number, since it uses as much as digits as its factorization.

18303157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310282.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 18303157 is about 4278.2189051053. The cubic root of 18303157 is about 263.5372450764.

The spelling of 18303157 in words is "eighteen million, three hundred three thousand, one hundred fifty-seven".