18018040 has 16 divisors (see below), whose sum is σ = 40540680. Its totient is φ = 7207200.

The previous prime is 18018029. The next prime is 18018043. The reversal of 18018040 is 4081081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18018043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225186 + ... + 225265.

Almost surely, 2^18018040 is an apocalyptic number.

18018040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18018040 is an abundant number, since it is smaller than the sum of its proper divisors (22522640).

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

18018040 is a wasteful number, since it uses less digits than its factorization.

18018040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450462 (or 450458 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 18018040 is about 4244.7661890851. The cubic root of 18018040 is about 262.1616623637.

The spelling of 18018040 in words is "eighteen million, eighteen thousand, forty".