18378441 has 32 divisors (see below), whose sum is σ = 28224000. Its totient is φ = 11813904.

The previous prime is 18378401. The next prime is 18378461. The reversal of 18378441 is 14487381.

It is not a de Polignac number, because 18378441 - 2⁷ = 18378313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18378396 and 18378405.

It is not an unprimeable number, because it can be changed into a prime (18378401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132150 + ... + 132288.

It is an arithmetic number, because the mean of its divisors is an integer number (882000).

Almost surely, 2^18378441 is an apocalyptic number.

It is an amenable number.

18378441 is a deficient number, since it is larger than the sum of its proper divisors (9845559).

18378441 is a wasteful number, since it uses less digits than its factorization.

18378441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290 (or 284 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 18378441 is about 4287.0083974725. The cubic root of 18378441 is about 263.8980753236.

The spelling of 18378441 in words is "eighteen million, three hundred seventy-eight thousand, four hundred forty-one".