18947938 has 8 divisors (see below), whose sum is σ = 28453932. Its totient is φ = 9463296.

The previous prime is 18947927. The next prime is 18947963. The reversal of 18947938 is 83974981.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18896409 + 51529 = 4347^2 + 227^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 18947891 and 18947900.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 2895 + ... + 6802.

Almost surely, 2^18947938 is an apocalyptic number.

18947938 is a deficient number, since it is larger than the sum of its proper divisors (9505994).

18947938 is an equidigital number, since it uses as much as digits as its factorization.

18947938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10676.

The product of its digits is 435456, while the sum is 49.

The square root of 18947938 is about 4352.9229260349. The cubic root of 18947938 is about 266.5962185434.

The spelling of 18947938 in words is "eighteen million, nine hundred forty-seven thousand, nine hundred thirty-eight".