980905 has 4 divisors (see below), whose sum is σ = 1177092. Its totient is φ = 784720.

The previous prime is 980899. The next prime is 980909. The reversal of 980905 is 509089.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509089 = 7 ⋅72727.

It can be written as a sum of positive squares in 2 ways, for example, as 419904 + 561001 = 648^2 + 749^2 .

It is not a de Polignac number, because 980905 - 2³ = 980897 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (980909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98086 + ... + 98095.

It is an arithmetic number, because the mean of its divisors is an integer number (294273).

2⁹⁸⁰⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

980905 is a deficient number, since it is larger than the sum of its proper divisors (196187).

980905 is a wasteful number, since it uses less digits than its factorization.

980905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196186.

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 980905 is about 990.4064822082. The cubic root of 980905 is about 99.3594051448.

The spelling of 980905 in words is "nine hundred eighty thousand, nine hundred five".