18941057 has 4 divisors (see below), whose sum is σ = 19403076. Its totient is φ = 18479040.

The previous prime is 18941051. The next prime is 18941059. The reversal of 18941057 is 75014981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75014981 = 53 ⋅1415377.

It can be written as a sum of positive squares in 2 ways, for example, as 2163841 + 16777216 = 1471^2 + 4096^2 .

It is a cyclic number.

It is not a de Polignac number, because 18941057 - 2⁶ = 18940993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18941051) 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, 230948 + ... + 231029.

It is an arithmetic number, because the mean of its divisors is an integer number (4850769).

Almost surely, 2^18941057 is an apocalyptic number.

It is an amenable number.

18941057 is a deficient number, since it is larger than the sum of its proper divisors (462019).

18941057 is an equidigital number, since it uses as much as digits as its factorization.

18941057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462018.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 18941057 is about 4352.1324658149. The cubic root of 18941057 is about 266.5639428997.

The spelling of 18941057 in words is "eighteen million, nine hundred forty-one thousand, fifty-seven".