2043645 has 16 divisors (see below), whose sum is σ = 3350592. Its totient is φ = 1063040.

The previous prime is 2043637. The next prime is 2043647. The reversal of 2043645 is 5463402.

It is not a de Polignac number, because 2043645 - 2³ = 2043637 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

2043645 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2043647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1047 + ... + 2276.

It is an arithmetic number, because the mean of its divisors is an integer number (209412).

2^2043645 is an apocalyptic number.

It is an amenable number.

2043645 is a deficient number, since it is larger than the sum of its proper divisors (1306947).

2043645 is a wasteful number, since it uses less digits than its factorization.

2043645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3372.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 2043645 is about 1429.5611214635. The cubic root of 2043645 is about 126.9020055435.

The spelling of 2043645 in words is "two million, forty-three thousand, six hundred forty-five".