8642405 has 4 divisors (see below), whose sum is σ = 10370892. Its totient is φ = 6913920.

The previous prime is 8642383. The next prime is 8642429. The reversal of 8642405 is 5042468.

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 2362369 + 6280036 = 1537^2 + 2506^2 .

It is a de Polignac number, because none of the positive numbers 2^k-8642405 is a prime.

It is an Ulam number.

It is a Duffinian 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, 864236 + ... + 864245.

It is an arithmetic number, because the mean of its divisors is an integer number (2592723).

Almost surely, 2^8642405 is an apocalyptic number.

It is an amenable number.

8642405 is a deficient number, since it is larger than the sum of its proper divisors (1728487).

8642405 is a wasteful number, since it uses less digits than its factorization.

8642405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728486.

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 8642405 is about 2939.7967616827. The cubic root of 8642405 is about 205.2161511504.

The spelling of 8642405 in words is "eight million, six hundred forty-two thousand, four hundred five".