18809407 has 4 divisors (see below), whose sum is σ = 18818320. Its totient is φ = 18800496.

The previous prime is 18809393. The next prime is 18809419. The reversal of 18809407 is 70490881.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 70490881 = 2531 ⋅27851.

It is a cyclic number.

It is not a de Polignac number, because 18809407 - 2²³ = 10420799 is a prime.

It is a super-3 number, since 3×18809407³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18809207) 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, 694 + ... + 6172.

It is an arithmetic number, because the mean of its divisors is an integer number (4704580).

Almost surely, 2^18809407 is an apocalyptic number.

18809407 is a deficient number, since it is larger than the sum of its proper divisors (8913).

18809407 is an equidigital number, since it uses as much as digits as its factorization.

18809407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8912.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 18809407 is about 4336.9813234553. The cubic root of 18809407 is about 265.9449214169.

The spelling of 18809407 in words is "eighteen million, eight hundred nine thousand, four hundred seven".