18408540 has 24 divisors (see below), whose sum is σ = 51544080. Its totient is φ = 4908928.

The previous prime is 18408521. The next prime is 18408541. The reversal of 18408540 is 4580481.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18408498 and 18408507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18408541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153345 + ... + 153464.

It is an arithmetic number, because the mean of its divisors is an integer number (2147670).

Almost surely, 2^18408540 is an apocalyptic number.

18408540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18408540 is an abundant number, since it is smaller than the sum of its proper divisors (33135540).

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

18408540 is a wasteful number, since it uses less digits than its factorization.

18408540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306821 (or 306819 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 18408540 is about 4290.5174513105. The cubic root of 18408540 is about 264.0420617096.

The spelling of 18408540 in words is "eighteen million, four hundred eight thousand, five hundred forty".