18775540 has 48 divisors (see below), whose sum is σ = 46174464. Its totient is φ = 6278400.

The previous prime is 18775507. The next prime is 18775571. The reversal of 18775540 is 4557781.

It is a self number, because there is not a number n which added to its sum of digits gives 18775540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4105 + ... + 7375.

It is an arithmetic number, because the mean of its divisors is an integer number (961968).

Almost surely, 2^18775540 is an apocalyptic number.

18775540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18775540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23087232).

18775540 is an abundant number, since it is smaller than the sum of its proper divisors (27398924).

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

18775540 is a wasteful number, since it uses less digits than its factorization.

18775540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3328 (or 3326 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 37.

The square root of 18775540 is about 4333.0751205120. The cubic root of 18775540 is about 265.7852111235.

The spelling of 18775540 in words is "eighteen million, seven hundred seventy-five thousand, five hundred forty".