18261012 has 48 divisors (see below), whose sum is σ = 53125632. Its totient is φ = 4742880.

The previous prime is 18260989. The next prime is 18261013. The reversal of 18261012 is 21016281.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 18261012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18261013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8958 + ... + 10805.

It is an arithmetic number, because the mean of its divisors is an integer number (1106784).

Almost surely, 2^18261012 is an apocalyptic number.

18261012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18261012 is an abundant number, since it is smaller than the sum of its proper divisors (34864620).

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

18261012 is a wasteful number, since it uses less digits than its factorization.

18261012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19788 (or 19786 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 18261012 is about 4273.2905354071. The cubic root of 18261012 is about 263.3348152812.

Adding to 18261012 its reverse (21016281), we get a palindrome (39277293).

The spelling of 18261012 in words is "eighteen million, two hundred sixty-one thousand, twelve".