82420405 has 4 divisors (see below), whose sum is σ = 98904492. Its totient is φ = 65936320.

The previous prime is 82420399. The next prime is 82420409. The reversal of 82420405 is 50402428.

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 9847044 + 72573361 = 3138^2 + 8519^2 .

It is not a de Polignac number, because 82420405 - 2³ = 82420397 is a prime.

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 82420405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82420409) 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, 8242036 + ... + 8242045.

It is an arithmetic number, because the mean of its divisors is an integer number (24726123).

Almost surely, 2^82420405 is an apocalyptic number.

It is an amenable number.

82420405 is a deficient number, since it is larger than the sum of its proper divisors (16484087).

82420405 is a wasteful number, since it uses less digits than its factorization.

82420405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16484086.

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 82420405 is about 9078.5684444190. The cubic root of 82420405 is about 435.1893393399.

The spelling of 82420405 in words is "eighty-two million, four hundred twenty thousand, four hundred five".