18428413 has 2 divisors, whose sum is σ = 18428414. Its totient is φ = 18428412.

The previous prime is 18428341. The next prime is 18428419. The reversal of 18428413 is 31482481.

Together with previous prime (18428341) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17614809 + 813604 = 4197^2 + 902^2 .

It is a cyclic number.

It is not a de Polignac number, because 18428413 - 2¹³ = 18420221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18428419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9214206 + 9214207.

It is an arithmetic number, because the mean of its divisors is an integer number (9214207).

Almost surely, 2^18428413 is an apocalyptic number.

It is an amenable number.

18428413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18428413 is an equidigital number, since it uses as much as digits as its factorization.

18428413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6144, while the sum is 31.

The square root of 18428413 is about 4292.8327477320. The cubic root of 18428413 is about 264.1370433644.

The spelling of 18428413 in words is "eighteen million, four hundred twenty-eight thousand, four hundred thirteen".