2045643 has 12 divisors (see below), whose sum is σ = 2853480. Its totient is φ = 1303456.

The previous prime is 2045629. The next prime is 2045647. The reversal of 2045643 is 3465402.

It is not a de Polignac number, because 2045643 - 2⁵ = 2045611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2045647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 943 + ... + 2231.

It is an arithmetic number, because the mean of its divisors is an integer number (237790).

2^2045643 is an apocalyptic number.

2045643 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2045643 is a deficient number, since it is larger than the sum of its proper divisors (807837).

2045643 is a wasteful number, since it uses less digits than its factorization.

2045643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338 (or 1315 counting only the distinct ones).

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

The square root of 2045643 is about 1430.2597666158. The cubic root of 2045643 is about 126.9433479525.

The spelling of 2045643 in words is "two million, forty-five thousand, six hundred forty-three".