18409834 has 8 divisors (see below), whose sum is σ = 27633060. Its totient is φ = 9198816.

The previous prime is 18409817. The next prime is 18409837. The reversal of 18409834 is 43890481.

It can be written as a sum of positive squares in 2 ways, for example, as 11881809 + 6528025 = 3447^2 + 2555^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 18409793 and 18409802.

It is not an unprimeable number, because it can be changed into a prime (18409837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3772 + ... + 7144.

Almost surely, 2^18409834 is an apocalyptic number.

18409834 is a deficient number, since it is larger than the sum of its proper divisors (9223226).

18409834 is a wasteful number, since it uses less digits than its factorization.

18409834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6104.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 18409834 is about 4290.6682463225. The cubic root of 18409834 is about 264.0482483748.

The spelling of 18409834 in words is "eighteen million, four hundred nine thousand, eight hundred thirty-four".