18985235406 has 16 divisors (see below), whose sum is σ = 37972298448. Its totient is φ = 6328107200.

The previous prime is 18985235389. The next prime is 18985235459. The reversal of 18985235406 is 60453258981.

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, 85186 + ... + 212666.

It is an arithmetic number, because the mean of its divisors is an integer number (2373268653).

Almost surely, 2^18985235406 is an apocalyptic number.

18985235406 is an abundant number, since it is smaller than the sum of its proper divisors (18987063042).

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

18985235406 is a wasteful number, since it uses less digits than its factorization.

18985235406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152307.

The product of its (nonzero) digits is 2073600, while the sum is 51.

The spelling of 18985235406 in words is "eighteen billion, nine hundred eighty-five million, two hundred thirty-five thousand, four hundred six".