2178023 has 4 divisors (see below), whose sum is σ = 2306160. Its totient is φ = 2049888.

The previous prime is 2177999. The next prime is 2178037. The reversal of 2178023 is 3208712.

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 2178023 - 2⁸ = 2177767 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2178023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2178073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64043 + ... + 64076.

It is an arithmetic number, because the mean of its divisors is an integer number (576540).

2^2178023 is an apocalyptic number.

2178023 is a deficient number, since it is larger than the sum of its proper divisors (128137).

2178023 is a wasteful number, since it uses less digits than its factorization.

2178023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128136.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2178023 is about 1475.8126574874. The cubic root of 2178023 is about 129.6246173008.

The spelling of 2178023 in words is "two million, one hundred seventy-eight thousand, twenty-three".