18098405 has 8 divisors (see below), whose sum is σ = 23388792. Its totient is φ = 13364928.

The previous prime is 18098363. The next prime is 18098411. The reversal of 18098405 is 50489081.

It can be written as a sum of positive squares in 4 ways, for example, as 776161 + 17322244 = 881^2 + 4162^2 .

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 18098405 - 2¹⁰ = 18097381 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 7 ways as a sum of consecutive naturals, for example, 139154 + ... + 139283.

It is an arithmetic number, because the mean of its divisors is an integer number (2923599).

Almost surely, 2^18098405 is an apocalyptic number.

It is an amenable number.

18098405 is a deficient number, since it is larger than the sum of its proper divisors (5290387).

18098405 is a wasteful number, since it uses less digits than its factorization.

18098405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278455.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 18098405 is about 4254.2220205344. Note that the first 3 decimals coincide. The cubic root of 18098405 is about 262.5508533374.

The spelling of 18098405 in words is "eighteen million, ninety-eight thousand, four hundred five".