44140821 has 4 divisors (see below), whose sum is σ = 58854432. Its totient is φ = 29427212.

The previous prime is 44140793. The next prime is 44140861. The reversal of 44140821 is 12804144.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-44140821 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 44140791 and 44140800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44140861) 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, 7356801 + ... + 7356806.

It is an arithmetic number, because the mean of its divisors is an integer number (14713608).

Almost surely, 2^44140821 is an apocalyptic number.

It is an amenable number.

44140821 is a deficient number, since it is larger than the sum of its proper divisors (14713611).

44140821 is a wasteful number, since it uses less digits than its factorization.

44140821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14713610.

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 44140821 is about 6643.8558834460. The cubic root of 44140821 is about 353.4110591042.

Adding to 44140821 its reverse (12804144), we get a palindrome (56944965).

The spelling of 44140821 in words is "forty-four million, one hundred forty thousand, eight hundred twenty-one".