18071424 has 192 divisors, whose sum is σ = 62375040. Its totient is φ = 5101056.

The previous prime is 18071411. The next prime is 18071461. The reversal of 18071424 is 42417081.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 217687 + ... + 217769.

It is an arithmetic number, because the mean of its divisors is an integer number (324870).

Almost surely, 2^18071424 is an apocalyptic number.

18071424 is a gapful number since it is divisible by the number (14) 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 18071424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31187520).

18071424 is an abundant number, since it is smaller than the sum of its proper divisors (44303616).

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

18071424 is an frugal number, since it uses more digits than its factorization.

18071424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 18071424 is about 4251.0497527081. The cubic root of 18071424 is about 262.4203186725.

The spelling of 18071424 in words is "eighteen million, seventy-one thousand, four hundred twenty-four".