8921605 has 16 divisors (see below), whose sum is σ = 13348224. Its totient is φ = 5561280.

The previous prime is 8921603. The next prime is 8921609. The reversal of 8921605 is 5061298.

It is not a de Polignac number, because 8921605 - 2¹ = 8921603 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8921603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11202 + ... + 11971.

It is an arithmetic number, because the mean of its divisors is an integer number (834264).

Almost surely, 2^8921605 is an apocalyptic number.

It is an amenable number.

8921605 is a deficient number, since it is larger than the sum of its proper divisors (4426619).

8921605 is a wasteful number, since it uses less digits than its factorization.

8921605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23196.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 8921605 is about 2986.9055894018. The cubic root of 8921605 is about 207.4026639816.

The spelling of 8921605 in words is "eight million, nine hundred twenty-one thousand, six hundred five".