18957844 has 12 divisors (see below), whose sum is σ = 33228468. Its totient is φ = 9464000.

The previous prime is 18957823. The next prime is 18957847. The reversal of 18957844 is 44875981.

It can be written as a sum of positive squares in 2 ways, for example, as 15760900 + 3196944 = 3970^2 + 1788^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18957794 and 18957803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18957847) 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, 577 + ... + 6184.

It is an arithmetic number, because the mean of its divisors is an integer number (2769039).

Almost surely, 2^18957844 is an apocalyptic number.

It is an amenable number.

18957844 is a deficient number, since it is larger than the sum of its proper divisors (14270624).

18957844 is a wasteful number, since it uses less digits than its factorization.

18957844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7466 (or 7464 counting only the distinct ones).

The product of its digits is 322560, while the sum is 46.

The square root of 18957844 is about 4354.0606334777. The cubic root of 18957844 is about 266.6426693683.

The spelling of 18957844 in words is "eighteen million, nine hundred fifty-seven thousand, eight hundred forty-four".