2043644026 has 4 divisors (see below), whose sum is σ = 3065466042. Its totient is φ = 1021822012.

The previous prime is 2043644023. The next prime is 2043644027. The reversal of 2043644026 is 6204463402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6204463402 = 2 ⋅3102231701.

It can be written as a sum of positive squares in only one way, i.e., 1668640801 + 375003225 = 40849^2 + 19365^2 .

It is not an unprimeable number, because it can be changed into a prime (2043644023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510911005 + ... + 510911008.

Almost surely, 2^2043644026 is an apocalyptic number.

2043644026 is a deficient number, since it is larger than the sum of its proper divisors (1021822016).

2043644026 is a wasteful number, since it uses less digits than its factorization.

2043644026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021822015.

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 2043644026 is about 45206.6812097504. The cubic root of 2043644026 is about 1269.0198538297.

The spelling of 2043644026 in words is "two billion, forty-three million, six hundred forty-four thousand, twenty-six".