18778412 has 6 divisors (see below), whose sum is σ = 32862228. Its totient is φ = 9389204.

The previous prime is 18778381. The next prime is 18778433. The reversal of 18778412 is 21487781.

It is a nialpdrome in base 11.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2347298 + ... + 2347305.

It is an arithmetic number, because the mean of its divisors is an integer number (5477038).

Almost surely, 2^18778412 is an apocalyptic number.

It is an amenable number.

18778412 is a deficient number, since it is larger than the sum of its proper divisors (14083816).

18778412 is a wasteful number, since it uses less digits than its factorization.

18778412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4694607 (or 4694605 counting only the distinct ones).

The product of its digits is 25088, while the sum is 38.

The square root of 18778412 is about 4333.4065122026. The cubic root of 18778412 is about 265.7987623753.

The spelling of 18778412 in words is "eighteen million, seven hundred seventy-eight thousand, four hundred twelve".