2123778 has 8 divisors (see below), whose sum is σ = 4247568. Its totient is φ = 707924.

The previous prime is 2123777. The next prime is 2123783. The reversal of 2123778 is 8773212.

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

2123778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (2123773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176976 + ... + 176987.

It is an arithmetic number, because the mean of its divisors is an integer number (530946).

2^2123778 is an apocalyptic number.

2123778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2123778 is a wasteful number, since it uses less digits than its factorization.

2123778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353968.

The product of its digits is 4704, while the sum is 30.

The square root of 2123778 is about 1457.3187708940. The cubic root of 2123778 is about 128.5394308380.

The spelling of 2123778 in words is "two million, one hundred twenty-three thousand, seven hundred seventy-eight".