18941938 has 4 divisors (see below), whose sum is σ = 28412910. Its totient is φ = 9470968.

The previous prime is 18941933. The next prime is 18941939. The reversal of 18941938 is 83914981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83914981 = 811 ⋅103471.

It can be written as a sum of positive squares in only one way, i.e., 16670889 + 2271049 = 4083^2 + 1507^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18941894 and 18941903.

It is not an unprimeable number, because it can be changed into a prime (18941933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4735483 + ... + 4735486.

Almost surely, 2^18941938 is an apocalyptic number.

18941938 is a deficient number, since it is larger than the sum of its proper divisors (9470972).

18941938 is an equidigital number, since it uses as much as digits as its factorization.

18941938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9470971.

The product of its digits is 62208, while the sum is 43.

The square root of 18941938 is about 4352.2336793881. The cubic root of 18941938 is about 266.5680757066.

The spelling of 18941938 in words is "eighteen million, nine hundred forty-one thousand, nine hundred thirty-eight".