18041240 has 32 divisors (see below), whose sum is σ = 46392480. Its totient is φ = 6185472.

The previous prime is 18041173. The next prime is 18041249. The reversal of 18041240 is 4214081.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18041249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31937 + ... + 32496.

It is an arithmetic number, because the mean of its divisors is an integer number (1449765).

Almost surely, 2^18041240 is an apocalyptic number.

18041240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18041240 is an abundant number, since it is smaller than the sum of its proper divisors (28351240).

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

18041240 is a wasteful number, since it uses less digits than its factorization.

18041240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64451 (or 64447 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 18041240 is about 4247.4980871096. The cubic root of 18041240 is about 262.2741337531.

It can be divided in two parts, 18041 and 240, that added together give a palindrome (18281).

The spelling of 18041240 in words is "eighteen million, forty-one thousand, two hundred forty".