18090427 has 2 divisors, whose sum is σ = 18090428. Its totient is φ = 18090426.

The previous prime is 18090409. The next prime is 18090463. The reversal of 18090427 is 72409081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18090427 - 2¹⁹ = 17566139 is a prime.

It is not a weakly prime, because it can be changed into another prime (18090467) by changing a digit.

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 as a sum of consecutive naturals, namely, 9045213 + 9045214.

It is an arithmetic number, because the mean of its divisors is an integer number (9045214).

Almost surely, 2^18090427 is an apocalyptic number.

18090427 is a deficient number, since it is larger than the sum of its proper divisors (1).

18090427 is an equidigital number, since it uses as much as digits as its factorization.

18090427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18090427 is about 4253.2842604275. The cubic root of 18090427 is about 262.5122691166.

The spelling of 18090427 in words is "eighteen million, ninety thousand, four hundred twenty-seven".