18620473 has 2 divisors, whose sum is σ = 18620474. Its totient is φ = 18620472.

The previous prime is 18620453. The next prime is 18620477. The reversal of 18620473 is 37402681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17909824 + 710649 = 4232^2 + 843^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18620473 is a prime.

It is not a weakly prime, because it can be changed into another prime (18620477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9310236 + 9310237.

It is an arithmetic number, because the mean of its divisors is an integer number (9310237).

Almost surely, 2^18620473 is an apocalyptic number.

It is an amenable number.

18620473 is a deficient number, since it is larger than the sum of its proper divisors (1).

18620473 is an equidigital number, since it uses as much as digits as its factorization.

18620473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 18620473 is about 4315.1446093961. The cubic root of 18620473 is about 265.0514816320.

The spelling of 18620473 in words is "eighteen million, six hundred twenty thousand, four hundred seventy-three".