18157828 has 24 divisors (see below), whose sum is σ = 35403480. Its totient is φ = 8090880.

The previous prime is 18157823. The next prime is 18157829. The reversal of 18157828 is 82875181.

It can be written as a sum of positive squares in 4 ways, for example, as 1364224 + 16793604 = 1168^2 + 4098^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18157823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4513 + ... + 7528.

It is an arithmetic number, because the mean of its divisors is an integer number (1475145).

Almost surely, 2^18157828 is an apocalyptic number.

It is an amenable number.

18157828 is a deficient number, since it is larger than the sum of its proper divisors (17245652).

18157828 is a wasteful number, since it uses less digits than its factorization.

18157828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12087 (or 12085 counting only the distinct ones).

The product of its digits is 35840, while the sum is 40.

The square root of 18157828 is about 4261.2003003849. The cubic root of 18157828 is about 262.8378862817.

The spelling of 18157828 in words is "eighteen million, one hundred fifty-seven thousand, eight hundred twenty-eight".