83440621 has 4 divisors (see below), whose sum is σ = 91026144. Its totient is φ = 75855100.

The previous prime is 83440613. The next prime is 83440631. The reversal of 83440621 is 12604438.

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 not a de Polignac number, because 83440621 - 2³ = 83440613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 83440621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83440631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3792745 + ... + 3792766.

It is an arithmetic number, because the mean of its divisors is an integer number (22756536).

Almost surely, 2^83440621 is an apocalyptic number.

It is an amenable number.

83440621 is a deficient number, since it is larger than the sum of its proper divisors (7585523).

83440621 is a wasteful number, since it uses less digits than its factorization.

83440621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7585522.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 83440621 is about 9134.5837890952. The cubic root of 83440621 is about 436.9776008013.

The spelling of 83440621 in words is "eighty-three million, four hundred forty thousand, six hundred twenty-one".