2021378 has 8 divisors (see below), whose sum is σ = 3163968. Its totient is φ = 966724.

The previous prime is 2021377. The next prime is 2021381. The reversal of 2021378 is 8731202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2021377) 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, 21926 + ... + 22017.

It is an arithmetic number, because the mean of its divisors is an integer number (395496).

2^2021378 is an apocalyptic number.

2021378 is a deficient number, since it is larger than the sum of its proper divisors (1142590).

2021378 is a wasteful number, since it uses less digits than its factorization.

2021378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43968.

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

The square root of 2021378 is about 1421.7517364153. The cubic root of 2021378 is about 126.4394248247.

The spelling of 2021378 in words is "two million, twenty-one thousand, three hundred seventy-eight".