18212736 has 64 divisors (see below), whose sum is σ = 49547520. Its totient is φ = 5924352.

The previous prime is 18212731. The next prime is 18212741. The reversal of 18212736 is 63721281.

It is an interprime number because it is at equal distance from previous prime (18212731) and next prime (18212741).

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18212731) 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 7 ways as a sum of consecutive naturals, for example, 15961 + ... + 17063.

It is an arithmetic number, because the mean of its divisors is an integer number (774180).

Almost surely, 2^18212736 is an apocalyptic number.

18212736 is a gapful number since it is divisible by the number (16) 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 18212736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24773760).

18212736 is an abundant number, since it is smaller than the sum of its proper divisors (31334784).

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

18212736 is a wasteful number, since it uses less digits than its factorization.

18212736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163 (or 1151 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 18212736 is about 4267.6382227176. The cubic root of 18212736 is about 263.1025541342.

The spelling of 18212736 in words is "eighteen million, two hundred twelve thousand, seven hundred thirty-six".