18491382 has 128 divisors (see below), whose sum is σ = 52254720. Its totient is φ = 4717440.

The previous prime is 18491381. The next prime is 18491399. The reversal of 18491382 is 28319481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18491381) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 260407 + ... + 260477.

It is an arithmetic number, because the mean of its divisors is an integer number (408240).

Almost surely, 2^18491382 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18491382, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26127360).

18491382 is an abundant number, since it is smaller than the sum of its proper divisors (33763338).

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

18491382 is a wasteful number, since it uses less digits than its factorization.

18491382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 149 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 18491382 is about 4300.1606946718. The cubic root of 18491382 is about 264.4375492060.

The spelling of 18491382 in words is "eighteen million, four hundred ninety-one thousand, three hundred eighty-two".