18528457 has 2 divisors, whose sum is σ = 18528458. Its totient is φ = 18528456.

The previous prime is 18528449. The next prime is 18528463. The reversal of 18528457 is 75482581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18139081 + 389376 = 4259^2 + 624^2 .

It is an emirp because it is prime and its reverse (75482581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18528457 - 2³ = 18528449 is a prime.

It is not a weakly prime, because it can be changed into another prime (18528407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9264228 + 9264229.

It is an arithmetic number, because the mean of its divisors is an integer number (9264229).

Almost surely, 2^18528457 is an apocalyptic number.

It is an amenable number.

18528457 is a deficient number, since it is larger than the sum of its proper divisors (1).

18528457 is an equidigital number, since it uses as much as digits as its factorization.

18528457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89600, while the sum is 40.

The square root of 18528457 is about 4304.4694214270. The cubic root of 18528457 is about 264.6141625983.

The spelling of 18528457 in words is "eighteen million, five hundred twenty-eight thousand, four hundred fifty-seven".