18825857 has 8 divisors (see below), whose sum is σ = 19106472. Its totient is φ = 18547200.

The previous prime is 18825841. The next prime is 18825869. The reversal of 18825857 is 75852881.

It can be written as a sum of positive squares in 4 ways, for example, as 128881 + 18696976 = 359^2 + 4324^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18825857 - 2⁴ = 18825841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18825887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40607 + ... + 41067.

It is an arithmetic number, because the mean of its divisors is an integer number (2388309).

Almost surely, 2^18825857 is an apocalyptic number.

It is an amenable number.

18825857 is a deficient number, since it is larger than the sum of its proper divisors (280615).

18825857 is an equidigital number, since it uses as much as digits as its factorization.

18825857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979.

The product of its digits is 179200, while the sum is 44.

The square root of 18825857 is about 4338.8773893716. The cubic root of 18825857 is about 266.0224273023.

The spelling of 18825857 in words is "eighteen million, eight hundred twenty-five thousand, eight hundred fifty-seven".