8164405 has 4 divisors (see below), whose sum is σ = 9797292. Its totient is φ = 6531520.

The previous prime is 8164397. The next prime is 8164441. The reversal of 8164405 is 5044618.

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 1580049 + 6584356 = 1257^2 + 2566^2 .

It is not a de Polignac number, because 8164405 - 2³ = 8164397 is a prime.

It is a Duffinian number.

8164405 is a lucky number.

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, 816436 + ... + 816445.

It is an arithmetic number, because the mean of its divisors is an integer number (2449323).

Almost surely, 2^8164405 is an apocalyptic number.

It is an amenable number.

8164405 is a deficient number, since it is larger than the sum of its proper divisors (1632887).

8164405 is a wasteful number, since it uses less digits than its factorization.

8164405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632886.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 8164405 is about 2857.3422966106. The cubic root of 8164405 is about 201.3607622991.

The spelling of 8164405 in words is "eight million, one hundred sixty-four thousand, four hundred five".