18018824240 has 40 divisors (see below), whose sum is σ = 41899349520. Its totient is φ = 7206569216.

The previous prime is 18018824203. The next prime is 18018824251. The reversal of 18018824240 is 4242881081.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 18018824194 and 18018824203.

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, 1187582 + ... + 1202658.

It is an arithmetic number, because the mean of its divisors is an integer number (1047483738).

Almost surely, 2^18018824240 is an apocalyptic number.

18018824240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18018824240 is an abundant number, since it is smaller than the sum of its proper divisors (23880525280).

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

18018824240 is a wasteful number, since it uses less digits than its factorization.

18018824240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30029 (or 30023 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 38.

The spelling of 18018824240 in words is "eighteen billion, eighteen million, eight hundred twenty-four thousand, two hundred forty".