18406260 has 72 divisors (see below), whose sum is σ = 56183400. Its totient is φ = 4877568.

The previous prime is 18406229. The next prime is 18406319. The reversal of 18406260 is 6260481.

It can be written as a sum of positive squares in 4 ways, for example, as 7986276 + 10419984 = 2826^2 + 3228^2 .

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 52566 + ... + 52914.

It is an arithmetic number, because the mean of its divisors is an integer number (780325).

Almost surely, 2^18406260 is an apocalyptic number.

18406260 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 18406260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28091700).

18406260 is an abundant number, since it is smaller than the sum of its proper divisors (37777140).

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

18406260 is a wasteful number, since it uses less digits than its factorization.

18406260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657 (or 652 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 18406260 is about 4290.2517408656. The cubic root of 18406260 is about 264.0311602338.

It can be divided in two parts, 1840 and 6260, that added together give a square (8100 = 90²).

The spelling of 18406260 in words is "eighteen million, four hundred six thousand, two hundred sixty".