8840040421 has 4 divisors (see below), whose sum is σ = 8845338700. Its totient is φ = 8834742144.

The previous prime is 8840040403. The next prime is 8840040431. The reversal of 8840040421 is 1240400488.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7162236900 + 1677803521 = 84630^2 + 40961^2 .

It is a cyclic number.

It is not a de Polignac number, because 8840040421 - 2¹⁵ = 8840007653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8840040401) 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, 2646636 + ... + 2649973.

It is an arithmetic number, because the mean of its divisors is an integer number (2211334675).

Almost surely, 2^8840040421 is an apocalyptic number.

It is an amenable number.

8840040421 is a deficient number, since it is larger than the sum of its proper divisors (5298279).

8840040421 is a wasteful number, since it uses less digits than its factorization.

8840040421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5298278.

The product of its (nonzero) digits is 8192, while the sum is 31.

The square root of 8840040421 is about 94021.4891447695. The cubic root of 8840040421 is about 2067.6867763265.

It can be divided in two parts, 88400 and 40421, that added together give a palindrome (128821).

The spelling of 8840040421 in words is "eight billion, eight hundred forty million, forty thousand, four hundred twenty-one".