18955378 has 12 divisors (see below), whose sum is σ = 30789018. Its totient is φ = 8748480.

The previous prime is 18955351. The next prime is 18955379. The reversal of 18955378 is 87355981.

It can be written as a sum of positive squares in 3 ways, for example, as 5139289 + 13816089 = 2267^2 + 3717^2 .

It is a super-3 number, since 3×18955378³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (18955379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27703 + ... + 28378.

Almost surely, 2^18955378 is an apocalyptic number.

18955378 is a deficient number, since it is larger than the sum of its proper divisors (11833640).

18955378 is a wasteful number, since it uses less digits than its factorization.

18955378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56109 (or 56096 counting only the distinct ones).

The product of its digits is 302400, while the sum is 46.

The square root of 18955378 is about 4353.7774403384. Note that the first 3 decimals coincide. The cubic root of 18955378 is about 266.6311074113.

The spelling of 18955378 in words is "eighteen million, nine hundred fifty-five thousand, three hundred seventy-eight".