82380821 has 4 divisors (see below), whose sum is σ = 82400352. Its totient is φ = 82361292.

The previous prime is 82380817. The next prime is 82380829. The reversal of 82380821 is 12808328.

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 82380821 - 2² = 82380817 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 (82380829) 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, 521 + ... + 12846.

It is an arithmetic number, because the mean of its divisors is an integer number (20600088).

Almost surely, 2^82380821 is an apocalyptic number.

It is an amenable number.

82380821 is a deficient number, since it is larger than the sum of its proper divisors (19531).

82380821 is a wasteful number, since it uses less digits than its factorization.

82380821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19530.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 82380821 is about 9076.3881032049. The cubic root of 82380821 is about 435.1196588065.

The spelling of 82380821 in words is "eighty-two million, three hundred eighty thousand, eight hundred twenty-one".