83821837 has 4 divisors (see below), whose sum is σ = 91442016. Its totient is φ = 76201660.

The previous prime is 83821817. The next prime is 83821847. The reversal of 83821837 is 73812838.

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-83821837 is a prime.

It is a super-2 number, since 2×83821837² = 14052200716109138, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83821837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83821807) 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, 3810073 + ... + 3810094.

It is an arithmetic number, because the mean of its divisors is an integer number (22860504).

Almost surely, 2^83821837 is an apocalyptic number.

It is an amenable number.

83821837 is a deficient number, since it is larger than the sum of its proper divisors (7620179).

83821837 is a wasteful number, since it uses less digits than its factorization.

83821837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7620178.

The product of its digits is 64512, while the sum is 40.

The square root of 83821837 is about 9155.4266421615. The cubic root of 83821837 is about 437.6420645578.

The spelling of 83821837 in words is "eighty-three million, eight hundred twenty-one thousand, eight hundred thirty-seven".