18738340 has 12 divisors (see below), whose sum is σ = 39350556. Its totient is φ = 7495328.

The previous prime is 18738337. The next prime is 18738361. The reversal of 18738340 is 4383781.

It can be written as a sum of positive squares in 2 ways, for example, as 2802276 + 15936064 = 1674^2 + 3992^2 .

It is a super-2 number, since 2×18738340² = 702250771911200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18738296 and 18738305.

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 3 ways as a sum of consecutive naturals, for example, 468439 + ... + 468478.

It is an arithmetic number, because the mean of its divisors is an integer number (3279213).

Almost surely, 2^18738340 is an apocalyptic number.

18738340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18738340 is an abundant number, since it is smaller than the sum of its proper divisors (20612216).

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

18738340 is a wasteful number, since it uses less digits than its factorization.

18738340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936926 (or 936924 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 18738340 is about 4328.7804287120. The cubic root of 18738340 is about 265.6095615479.

The spelling of 18738340 in words is "eighteen million, seven hundred thirty-eight thousand, three hundred forty".