18701040 has 80 divisors (see below), whose sum is σ = 58889088. Its totient is φ = 4908288.

The previous prime is 18701017. The next prime is 18701041. The reversal of 18701040 is 4010781.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 18700998 and 18701016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18701041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15499 + ... + 16661.

Almost surely, 2^18701040 is an apocalyptic number.

18701040 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 18701040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29444544).

18701040 is an abundant number, since it is smaller than the sum of its proper divisors (40188048).

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

18701040 is a wasteful number, since it uses less digits than its factorization.

18701040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246 (or 1240 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 18701040 is about 4324.4699097115. The cubic root of 18701040 is about 265.4332062320.

The spelling of 18701040 in words is "eighteen million, seven hundred one thousand, forty".