18261306 has 24 divisors (see below), whose sum is σ = 45218784. Its totient is φ = 5217480.

The previous prime is 18261301. The next prime is 18261307. The reversal of 18261306 is 60316281.

It is a self number, because there is not a number n which added to its sum of digits gives 18261306.

It is not an unprimeable number, because it can be changed into a prime (18261301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72340 + ... + 72591.

It is an arithmetic number, because the mean of its divisors is an integer number (1884116).

Almost surely, 2^18261306 is an apocalyptic number.

18261306 is an abundant number, since it is smaller than the sum of its proper divisors (26957478).

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

18261306 is a wasteful number, since it uses less digits than its factorization.

18261306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144946 (or 144943 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18261306 is about 4273.3249349891. The cubic root of 18261306 is about 263.3362284928.

Adding to 18261306 its reverse (60316281), we get a palindrome (78577587).

The spelling of 18261306 in words is "eighteen million, two hundred sixty-one thousand, three hundred six".