18740736 has 180 divisors, whose sum is σ = 63675612. Its totient is φ = 5289984.

The previous prime is 18740719. The next prime is 18740737. The reversal of 18740736 is 63704781.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18740736.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18740737) 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 17 ways as a sum of consecutive naturals, for example, 225751 + ... + 225833.

Almost surely, 2^18740736 is an apocalyptic number.

18740736 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 18740736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31837806).

18740736 is an abundant number, since it is smaller than the sum of its proper divisors (44934876).

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

18740736 is an equidigital number, since it uses as much as digits as its factorization.

18740736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 18740736 is about 4329.0571721796. The cubic root of 18740736 is about 265.6208818923.

The spelling of 18740736 in words is "eighteen million, seven hundred forty thousand, seven hundred thirty-six".