18036457 has 2 divisors, whose sum is σ = 18036458. Its totient is φ = 18036456.

The previous prime is 18036449. The next prime is 18036509. The reversal of 18036457 is 75463081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12787776 + 5248681 = 3576^2 + 2291^2 .

It is an emirp because it is prime and its reverse (75463081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18036457 - 2³ = 18036449 is a prime.

It is a super-2 number, since 2×18036457² = 650627562225698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18036407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9018228 + 9018229.

It is an arithmetic number, because the mean of its divisors is an integer number (9018229).

Almost surely, 2^18036457 is an apocalyptic number.

It is an amenable number.

18036457 is a deficient number, since it is larger than the sum of its proper divisors (1).

18036457 is an equidigital number, since it uses as much as digits as its factorization.

18036457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 18036457 is about 4246.9350124531. The cubic root of 18036457 is about 262.2509541184.

The spelling of 18036457 in words is "eighteen million, thirty-six thousand, four hundred fifty-seven".