8081405 has 4 divisors (see below), whose sum is σ = 9697692. Its totient is φ = 6465120.

The previous prime is 8081399. The next prime is 8081419. The reversal of 8081405 is 5041808.

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 1352569 + 6728836 = 1163^2 + 2594^2 .

It is not a de Polignac number, because 8081405 - 2²⁰ = 7032829 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 808136 + ... + 808145.

It is an arithmetic number, because the mean of its divisors is an integer number (2424423).

Almost surely, 2^8081405 is an apocalyptic number.

It is an amenable number.

8081405 is a deficient number, since it is larger than the sum of its proper divisors (1616287).

8081405 is a wasteful number, since it uses less digits than its factorization.

8081405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616286.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 8081405 is about 2842.7812086054. The cubic root of 8081405 is about 200.6760869568.

The spelling of 8081405 in words is "eight million, eighty-one thousand, four hundred five".