18105724 has 24 divisors (see below), whose sum is σ = 38997728. Its totient is φ = 7162560.

The previous prime is 18105713. The next prime is 18105749. The reversal of 18105724 is 42750181.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 18105692 and 18105701.

It is a congruent number.

It is an unprimeable number.

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, 24507 + ... + 25234.

Almost surely, 2^18105724 is an apocalyptic number.

18105724 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18105724 is an abundant number, since it is smaller than the sum of its proper divisors (20892004).

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

18105724 is a wasteful number, since it uses less digits than its factorization.

18105724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49765 (or 49763 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 18105724 is about 4255.0821378676. The cubic root of 18105724 is about 262.5862404470.

The spelling of 18105724 in words is "eighteen million, one hundred five thousand, seven hundred twenty-four".