2045778 has 32 divisors (see below), whose sum is σ = 4752384. Its totient is φ = 574992.

The previous prime is 2045773. The next prime is 2045789. The reversal of 2045778 is 8775402.

It is not an unprimeable number, because it can be changed into a prime (2045773) 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 15 ways as a sum of consecutive naturals, for example, 2451 + ... + 3177.

It is an arithmetic number, because the mean of its divisors is an integer number (148512).

2^2045778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2045778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2376192).

2045778 is an abundant number, since it is smaller than the sum of its proper divisors (2706606).

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

2045778 is a wasteful number, since it uses less digits than its factorization.

2045778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 2045778 is about 1430.3069600614. The cubic root of 2045778 is about 126.9461403875.

The spelling of 2045778 in words is "two million, forty-five thousand, seven hundred seventy-eight".