18405361 has 8 divisors (see below), whose sum is σ = 19865384. Its totient is φ = 16951680.

The previous prime is 18405353. The next prime is 18405397. The reversal of 18405361 is 16350481.

It can be written as a sum of positive squares in 4 ways, for example, as 3629025 + 14776336 = 1905^2 + 3844^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18405361 - 2³ = 18405353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18405301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5725 + ... + 8341.

It is an arithmetic number, because the mean of its divisors is an integer number (2483173).

Almost surely, 2^18405361 is an apocalyptic number.

It is an amenable number.

18405361 is a deficient number, since it is larger than the sum of its proper divisors (1460023).

18405361 is a wasteful number, since it uses less digits than its factorization.

18405361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3171.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 18405361 is about 4290.1469671796. The cubic root of 18405361 is about 264.0268615536.

The spelling of 18405361 in words is "eighteen million, four hundred five thousand, three hundred sixty-one".