2089778 has 4 divisors (see below), whose sum is σ = 3134670. Its totient is φ = 1044888.

The previous prime is 2089751. The next prime is 2089781. The reversal of 2089778 is 8779802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8779802 = 2 ⋅4389901.

It can be written as a sum of positive squares in only one way, i.e., 1181569 + 908209 = 1087^2 + 953^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 522443 + ... + 522446.

2^2089778 is an apocalyptic number.

2089778 is a deficient number, since it is larger than the sum of its proper divisors (1044892).

2089778 is a wasteful number, since it uses less digits than its factorization.

2089778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044891.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 2089778 is about 1445.6064471356. The cubic root of 2089778 is about 127.8497994032.

It can be divided in two parts, 20 and 89778, that added together give a palindrome (89798).

The spelling of 2089778 in words is "two million, eighty-nine thousand, seven hundred seventy-eight".