8042905 has 8 divisors (see below), whose sum is σ = 10393992. Its totient is φ = 5939328.

The previous prime is 8042897. The next prime is 8042917. The reversal of 8042905 is 5092408.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1183744 + 6859161 = 1088^2 + 2619^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8042905 - 2³ = 8042897 is a prime.

It is a Duffinian number.

8042905 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61804 + ... + 61933.

It is an arithmetic number, because the mean of its divisors is an integer number (1299249).

Almost surely, 2^8042905 is an apocalyptic number.

It is an amenable number.

8042905 is a deficient number, since it is larger than the sum of its proper divisors (2351087).

8042905 is a wasteful number, since it uses less digits than its factorization.

8042905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123755.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 8042905 is about 2836.0015867414. The cubic root of 8042905 is about 200.3569043841.

The spelling of 8042905 in words is "eight million, forty-two thousand, nine hundred five".