83740021 has 8 divisors (see below), whose sum is σ = 86713088. Its totient is φ = 80784000.

The previous prime is 83740001. The next prime is 83740043. The reversal of 83740021 is 12004738.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 83740021 - 2¹³ = 83731829 is a prime.

It is a super-3 number, since 3×83740021³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83740001) 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 7 ways as a sum of consecutive naturals, for example, 6181 + ... + 14341.

It is an arithmetic number, because the mean of its divisors is an integer number (10839136).

Almost surely, 2^83740021 is an apocalyptic number.

It is an amenable number.

83740021 is a deficient number, since it is larger than the sum of its proper divisors (2973067).

83740021 is a wasteful number, since it uses less digits than its factorization.

83740021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8523.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 83740021 is about 9150.9573816077. The cubic root of 83740021 is about 437.4996284078.

Adding to 83740021 its reverse (12004738), we get a palindrome (95744759).

The spelling of 83740021 in words is "eighty-three million, seven hundred forty thousand, twenty-one".