2045890 has 32 divisors (see below), whose sum is σ = 4593024. Its totient is φ = 637440.

The previous prime is 2045881. The next prime is 2045891. The reversal of 2045890 is 985402.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2045891) 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, 559 + ... + 2098.

It is an arithmetic number, because the mean of its divisors is an integer number (143532).

2^2045890 is an apocalyptic number.

2045890 is an abundant number, since it is smaller than the sum of its proper divisors (2547134).

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

2045890 is a wasteful number, since it uses less digits than its factorization.

2045890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2682.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 2045890 is about 1430.3461119603. The cubic root of 2045890 is about 126.9484569810.

The spelling of 2045890 in words is "two million, forty-five thousand, eight hundred ninety".