18802340 has 36 divisors (see below), whose sum is σ = 41957076. Its totient is φ = 7076352.

The previous prime is 18802331. The next prime is 18802349. The reversal of 18802340 is 4320881.

It is an interprime number because it is at equal distance from previous prime (18802331) and next prime (18802349).

It can be written as a sum of positive squares in 6 ways, for example, as 5683456 + 13118884 = 2384^2 + 3622^2 .

It is not an unprimeable number, because it can be changed into a prime (18802349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4154 + ... + 7406.

Almost surely, 2^18802340 is an apocalyptic number.

18802340 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 18802340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20978538).

18802340 is an abundant number, since it is smaller than the sum of its proper divisors (23154736).

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

18802340 is a wasteful number, since it uses less digits than its factorization.

18802340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3296 (or 3277 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 18802340 is about 4336.1665097180. The cubic root of 18802340 is about 265.9116106345.

The spelling of 18802340 in words is "eighteen million, eight hundred two thousand, three hundred forty".