18243269406 has 96 divisors (see below), whose sum is σ = 42101130240. Its totient is φ = 5693006592.

The previous prime is 18243269393. The next prime is 18243269413. The reversal of 18243269406 is 60496234281.

18243269406 is a `hidden beast` number, since 182 + 4 + 3 + 2 + 69 + 406 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21138931 + ... + 21139793.

It is an arithmetic number, because the mean of its divisors is an integer number (438553440).

Almost surely, 2^18243269406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18243269406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21050565120).

18243269406 is an abundant number, since it is smaller than the sum of its proper divisors (23857860834).

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

18243269406 is a wasteful number, since it uses less digits than its factorization.

18243269406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550 (or 1547 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 18243269406 in words is "eighteen billion, two hundred forty-three million, two hundred sixty-nine thousand, four hundred six".