18378023 has 4 divisors (see below), whose sum is σ = 18401880. Its totient is φ = 18354168.

The previous prime is 18378013. The next prime is 18378029. The reversal of 18378023 is 32087381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18378023 - 2¹⁴ = 18361639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18378029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10733 + ... + 12326.

It is an arithmetic number, because the mean of its divisors is an integer number (4600470).

Almost surely, 2^18378023 is an apocalyptic number.

18378023 is a deficient number, since it is larger than the sum of its proper divisors (23857).

18378023 is an equidigital number, since it uses as much as digits as its factorization.

18378023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23856.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 18378023 is about 4286.9596452498. The cubic root of 18378023 is about 263.8960746056.

The spelling of 18378023 in words is "eighteen million, three hundred seventy-eight thousand, twenty-three".