18449340 has 192 divisors, whose sum is σ = 66232320. Its totient is φ = 3732480.

The previous prime is 18449339. The next prime is 18449357. The reversal of 18449340 is 4394481.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 169206 + ... + 169314.

It is an arithmetic number, because the mean of its divisors is an integer number (344960).

Almost surely, 2^18449340 is an apocalyptic number.

18449340 is a gapful number since it is divisible by the number (10) 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 18449340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33116160).

18449340 is an abundant number, since it is smaller than the sum of its proper divisors (47782980).

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

18449340 is a wasteful number, since it uses less digits than its factorization.

18449340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 18449340 is about 4295.2694909633. The cubic root of 18449340 is about 264.2369887562.

The spelling of 18449340 in words is "eighteen million, four hundred forty-nine thousand, three hundred forty".