18000406 has 4 divisors (see below), whose sum is σ = 27000612. Its totient is φ = 9000202.

The previous prime is 18000403. The next prime is 18000407. The reversal of 18000406 is 60400081.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18000401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4500100 + ... + 4500103.

It is an arithmetic number, because the mean of its divisors is an integer number (6750153).

Almost surely, 2^18000406 is an apocalyptic number.

18000406 is a deficient number, since it is larger than the sum of its proper divisors (9000206).

18000406 is an equidigital number, since it uses as much as digits as its factorization.

18000406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9000205.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 18000406 is about 4242.6885344083. The cubic root of 18000406 is about 262.0761098153.

Adding to 18000406 its reverse (60400081), we get a palindrome (78400487).

The spelling of 18000406 in words is "eighteen million, four hundred six", and thus it is an aban number.