18641406 has 32 divisors (see below), whose sum is σ = 43096320. Its totient is φ = 5265216.

The previous prime is 18641387. The next prime is 18641419. The reversal of 18641406 is 60414681.

18641406 is nontrivially palindromic in base 12.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1245 + ... + 6231.

It is an arithmetic number, because the mean of its divisors is an integer number (1346760).

Almost surely, 2^18641406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18641406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21548160).

18641406 is an abundant number, since it is smaller than the sum of its proper divisors (24454914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18641406 is a wasteful number, since it uses less digits than its factorization.

18641406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5088.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18641406 is about 4317.5694551449. The cubic root of 18641406 is about 265.1507674170.

The spelling of 18641406 in words is "eighteen million, six hundred forty-one thousand, four hundred six".