18261468 has 72 divisors (see below), whose sum is σ = 49886928. Its totient is φ = 5611008.

The previous prime is 18261437. The next prime is 18261479. The reversal of 18261468 is 86416281.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 32155 + ... + 32717.

It is an arithmetic number, because the mean of its divisors is an integer number (692874).

Almost surely, 2^18261468 is an apocalyptic number.

18261468 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18261468 is the 2703-rd heptagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18261468, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24943464).

18261468 is an abundant number, since it is smaller than the sum of its proper divisors (31625460).

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

18261468 is a wasteful number, since it uses less digits than its factorization.

18261468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643 (or 638 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 18261468 is about 4273.3438897426. The cubic root of 18261468 is about 263.3370071947.

The spelling of 18261468 in words is "eighteen million, two hundred sixty-one thousand, four hundred sixty-eight".