18836440 has 32 divisors (see below), whose sum is σ = 48437280. Its totient is φ = 6458112.

The previous prime is 18836423. The next prime is 18836449. The reversal of 18836440 is 4463881.

It is a super-2 number, since 2×18836440² = 709622943747200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18836396 and 18836405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18836449) 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, 33357 + ... + 33916.

It is an arithmetic number, because the mean of its divisors is an integer number (1513665).

Almost surely, 2^18836440 is an apocalyptic number.

18836440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18836440 is an abundant number, since it is smaller than the sum of its proper divisors (29600840).

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

18836440 is a wasteful number, since it uses less digits than its factorization.

18836440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67291 (or 67287 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 18836440 is about 4340.0967731146. The cubic root of 18836440 is about 266.0722663432.

The spelling of 18836440 in words is "eighteen million, eight hundred thirty-six thousand, four hundred forty".