18428257409 has 4 divisors (see below), whose sum is σ = 19229486016. Its totient is φ = 17627028804.

The previous prime is 18428257373. The next prime is 18428257429. The reversal of 18428257409 is 90475282481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90475282481 = 43963 ⋅2057987.

It is a cyclic number.

It is not a de Polignac number, because 18428257409 - 2⁸ = 18428257153 is a prime.

It is a super-2 number, since 2×18428257409² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18428257429) 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 in 3 ways as a sum of consecutive naturals, for example, 400614269 + ... + 400614314.

It is an arithmetic number, because the mean of its divisors is an integer number (4807371504).

Almost surely, 2^18428257409 is an apocalyptic number.

It is an amenable number.

18428257409 is a deficient number, since it is larger than the sum of its proper divisors (801228607).

18428257409 is an equidigital number, since it uses as much as digits as its factorization.

18428257409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801228606.

The product of its (nonzero) digits is 1290240, while the sum is 50.

The spelling of 18428257409 in words is "eighteen billion, four hundred twenty-eight million, two hundred fifty-seven thousand, four hundred nine".