18772380 has 144 divisors (see below), whose sum is σ = 65520000. Its totient is φ = 4302720.

The previous prime is 18772373. The next prime is 18772409. The reversal of 18772380 is 8327781.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 37371 + ... + 37869.

It is an arithmetic number, because the mean of its divisors is an integer number (455000).

Almost surely, 2^18772380 is an apocalyptic number.

18772380 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 18772380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32760000).

18772380 is an abundant number, since it is smaller than the sum of its proper divisors (46747620).

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

18772380 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 9 representation: 18772380 = (38281770)₉.

18772380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 18772380 is about 4332.7104680558. The cubic root of 18772380 is about 265.7702993750.

The spelling of 18772380 in words is "eighteen million, seven hundred seventy-two thousand, three hundred eighty".