18119405 has 4 divisors (see below), whose sum is σ = 21743292. Its totient is φ = 14495520.

The previous prime is 18119363. The next prime is 18119411. The reversal of 18119405 is 50491181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50491181 = 13 ⋅3883937.

It can be written as a sum of positive squares in 2 ways, for example, as 4116841 + 14002564 = 2029^2 + 3742^2 .

It is not a de Polignac number, because 18119405 - 2⁶ = 18119341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1811936 + ... + 1811945.

It is an arithmetic number, because the mean of its divisors is an integer number (5435823).

Almost surely, 2^18119405 is an apocalyptic number.

It is an amenable number.

18119405 is a deficient number, since it is larger than the sum of its proper divisors (3623887).

18119405 is an equidigital number, since it uses as much as digits as its factorization.

18119405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3623886.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 18119405 is about 4256.6894413382. The cubic root of 18119405 is about 262.6523620392.

The spelling of 18119405 in words is "eighteen million, one hundred nineteen thousand, four hundred five".