18626740 has 72 divisors (see below), whose sum is σ = 44241120. Its totient is φ = 6578880.

The previous prime is 18626731. The next prime is 18626743. The reversal of 18626740 is 4762681.

It is a junction number, because it is equal to n+sod(n) for n = 18626696 and 18626705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18626743) 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 23 ways as a sum of consecutive naturals, for example, 103971 + ... + 104149.

It is an arithmetic number, because the mean of its divisors is an integer number (614460).

Almost surely, 2^18626740 is an apocalyptic number.

18626740 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 18626740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22120560).

18626740 is an abundant number, since it is smaller than the sum of its proper divisors (25614380).

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

18626740 is a wasteful number, since it uses less digits than its factorization.

18626740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253 (or 240 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 18626740 is about 4315.8707116873. The cubic root of 18626740 is about 265.0812139830.

The spelling of 18626740 in words is "eighteen million, six hundred twenty-six thousand, seven hundred forty".