18782947 has 2 divisors, whose sum is σ = 18782948. Its totient is φ = 18782946.

The previous prime is 18782941. The next prime is 18782957. The reversal of 18782947 is 74928781.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18782947 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18782897 and 18782906.

It is not a weakly prime, because it can be changed into another prime (18782941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9391473 + 9391474.

It is an arithmetic number, because the mean of its divisors is an integer number (9391474).

Almost surely, 2^18782947 is an apocalyptic number.

18782947 is a deficient number, since it is larger than the sum of its proper divisors (1).

18782947 is an equidigital number, since it uses as much as digits as its factorization.

18782947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 46.

The square root of 18782947 is about 4333.9297410087. The cubic root of 18782947 is about 265.8201575171.

The spelling of 18782947 in words is "eighteen million, seven hundred eighty-two thousand, nine hundred forty-seven".