2044400641 has 4 divisors (see below), whose sum is σ = 2082974292. Its totient is φ = 2005826992.

The previous prime is 2044400629. The next prime is 2044400651. The reversal of 2044400641 is 1460044402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1460044402 = 2 ⋅730022201.

It can be written as a sum of positive squares in 2 ways, for example, as 791240641 + 1253160000 = 28129^2 + 35400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2044400641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2044400651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19286746 + ... + 19286851.

It is an arithmetic number, because the mean of its divisors is an integer number (520743573).

Almost surely, 2^2044400641 is an apocalyptic number.

It is an amenable number.

2044400641 is a deficient number, since it is larger than the sum of its proper divisors (38573651).

2044400641 is an equidigital number, since it uses as much as digits as its factorization.

2044400641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38573650.

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 2044400641 is about 45215.0488333254. The cubic root of 2044400641 is about 1269.1764435580.

The spelling of 2044400641 in words is "two billion, forty-four million, four hundred thousand, six hundred forty-one".