18591072 has 48 divisors (see below), whose sum is σ = 50383872. Its totient is φ = 5996160.

The previous prime is 18591071. The next prime is 18591091. The reversal of 18591072 is 27019581.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18591071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148 + ... + 6099.

It is an arithmetic number, because the mean of its divisors is an integer number (1049664).

Almost surely, 2^18591072 is an apocalyptic number.

18591072 is a gapful number since it is divisible by the number (12) 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 18591072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25191936).

18591072 is an abundant number, since it is smaller than the sum of its proper divisors (31792800).

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

18591072 is a wasteful number, since it uses less digits than its factorization.

18591072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6291 (or 6283 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 18591072 is about 4311.7365411166. The cubic root of 18591072 is about 264.9119061638.

The spelling of 18591072 in words is "eighteen million, five hundred ninety-one thousand, seventy-two".