18378465 has 32 divisors (see below), whose sum is σ = 33958656. Its totient is φ = 8313600.

The previous prime is 18378461. The next prime is 18378473. The reversal of 18378465 is 56487381.

It is not a de Polignac number, because 18378465 - 2² = 18378461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18378461) 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, 9739 + ... + 11471.

It is an arithmetic number, because the mean of its divisors is an integer number (1061208).

Almost surely, 2^18378465 is an apocalyptic number.

18378465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18378465 is a deficient number, since it is larger than the sum of its proper divisors (15580191).

18378465 is a wasteful number, since it uses less digits than its factorization.

18378465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849.

The product of its digits is 161280, while the sum is 42.

The square root of 18378465 is about 4287.0111966264. The cubic root of 18378465 is about 263.8981901964.

The spelling of 18378465 in words is "eighteen million, three hundred seventy-eight thousand, four hundred sixty-five".