18948623 has 2 divisors, whose sum is σ = 18948624. Its totient is φ = 18948622.

The previous prime is 18948569. The next prime is 18948641. The reversal of 18948623 is 32684981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18948623 is a prime.

It is a super-2 number, since 2×18948623² = 718100627192258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18948653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9474311 + 9474312.

It is an arithmetic number, because the mean of its divisors is an integer number (9474312).

Almost surely, 2^18948623 is an apocalyptic number.

18948623 is a deficient number, since it is larger than the sum of its proper divisors (1).

18948623 is an equidigital number, since it uses as much as digits as its factorization.

18948623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 41.

The square root of 18948623 is about 4353.0016080861. The cubic root of 18948623 is about 266.5994311394.

The spelling of 18948623 in words is "eighteen million, nine hundred forty-eight thousand, six hundred twenty-three".