83829821 has 4 divisors (see below), whose sum is σ = 83907612. Its totient is φ = 83752032.

The previous prime is 83829803. The next prime is 83829857. The reversal of 83829821 is 12892838.

It is a happy number.

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 60684100 + 23145721 = 7790^2 + 4811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83829821 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 (83819821) 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, 37256 + ... + 39441.

It is an arithmetic number, because the mean of its divisors is an integer number (20976903).

Almost surely, 2^83829821 is an apocalyptic number.

It is an amenable number.

83829821 is a deficient number, since it is larger than the sum of its proper divisors (77791).

83829821 is a wasteful number, since it uses less digits than its factorization.

83829821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77790.

The product of its digits is 55296, while the sum is 41.

The square root of 83829821 is about 9155.8626573360. The cubic root of 83829821 is about 437.6559592001.

The spelling of 83829821 in words is "eighty-three million, eight hundred twenty-nine thousand, eight hundred twenty-one".