1818157 has 4 divisors (see below), whose sum is σ = 1983456. Its totient is φ = 1652860.

The previous prime is 1818151. The next prime is 1818161. The reversal of 1818157 is 7518181.

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: 7518181 = 11 ⋅683471.

It is not a de Polignac number, because 1818157 - 2¹⁹ = 1293869 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818151) 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, 82633 + ... + 82654.

It is an arithmetic number, because the mean of its divisors is an integer number (495864).

2^1818157 is an apocalyptic number.

It is an amenable number.

1818157 is a deficient number, since it is larger than the sum of its proper divisors (165299).

1818157 is a wasteful number, since it uses less digits than its factorization.

1818157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165298.

The product of its digits is 2240, while the sum is 31.

The square root of 1818157 is about 1348.3905220670. The cubic root of 1818157 is about 122.0516891068.

It can be divided in two parts, 181 and 8157, that added together give a palindrome (8338).

The spelling of 1818157 in words is "one million, eight hundred eighteen thousand, one hundred fifty-seven".