18780380 has 12 divisors (see below), whose sum is σ = 39438840. Its totient is φ = 7512144.

The previous prime is 18780347. The next prime is 18780383. The reversal of 18780380 is 8308781.

It is a self number, because there is not a number n which added to its sum of digits gives 18780380.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18780383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469490 + ... + 469529.

It is an arithmetic number, because the mean of its divisors is an integer number (3286570).

Almost surely, 2^18780380 is an apocalyptic number.

18780380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18780380 is an abundant number, since it is smaller than the sum of its proper divisors (20658460).

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

18780380 is a wasteful number, since it uses less digits than its factorization.

18780380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939028 (or 939026 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 18780380 is about 4333.6335793419. The cubic root of 18780380 is about 265.8080473935.

The spelling of 18780380 in words is "eighteen million, seven hundred eighty thousand, three hundred eighty".