18201040 has 160 divisors (see below), whose sum is σ = 52246656. Its totient is φ = 5806080.

The previous prime is 18201013. The next prime is 18201041. The reversal of 18201040 is 4010281.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18201041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 423259 + ... + 423301.

Almost surely, 2^18201040 is an apocalyptic number.

18201040 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 18201040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26123328).

18201040 is an abundant number, since it is smaller than the sum of its proper divisors (34045616).

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

18201040 is a wasteful number, since it uses less digits than its factorization.

18201040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 18201040 is about 4266.2676896791. The cubic root of 18201040 is about 263.0462216419.

The spelling of 18201040 in words is "eighteen million, two hundred one thousand, forty".