18789340 has 24 divisors (see below), whose sum is σ = 40525632. Its totient is φ = 7312320.

The previous prime is 18789319. The next prime is 18789343. The reversal of 18789340 is 4398781.

It is a junction number, because it is equal to n+sod(n) for n = 18789293 and 18789302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18789343) 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, 11956 + ... + 13435.

It is an arithmetic number, because the mean of its divisors is an integer number (1688568).

Almost surely, 2^18789340 is an apocalyptic number.

18789340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18789340 is an abundant number, since it is smaller than the sum of its proper divisors (21736292).

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

18789340 is a wasteful number, since it uses less digits than its factorization.

18789340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25437 (or 25435 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 18789340 is about 4334.6672305957. The cubic root of 18789340 is about 265.8503124497.

The spelling of 18789340 in words is "eighteen million, seven hundred eighty-nine thousand, three hundred forty".