18947738 has 8 divisors (see below), whose sum is σ = 28764288. Its totient is φ = 9359644.

The previous prime is 18947729. The next prime is 18947749. The reversal of 18947738 is 83774981.

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 = 18947692 and 18947701.

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, 56906 + ... + 57237.

It is an arithmetic number, because the mean of its divisors is an integer number (3595536).

Almost surely, 2^18947738 is an apocalyptic number.

18947738 is a deficient number, since it is larger than the sum of its proper divisors (9816550).

18947738 is a wasteful number, since it uses less digits than its factorization.

18947738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114228.

The product of its digits is 338688, while the sum is 47.

The square root of 18947738 is about 4352.8999529050. The cubic root of 18947738 is about 266.5952805446.

The spelling of 18947738 in words is "eighteen million, nine hundred forty-seven thousand, seven hundred thirty-eight".