980405 has 4 divisors (see below), whose sum is σ = 1176492. Its totient is φ = 784320.

The previous prime is 980401. The next prime is 980417. The reversal of 980405 is 504089.

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 708964 + 271441 = 842^2 + 521^2 .

It is not a de Polignac number, because 980405 - 2² = 980401 is a prime.

It is a super-2 number, since 2×980405² = 1922387928050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (980401) 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, 98036 + ... + 98045.

It is an arithmetic number, because the mean of its divisors is an integer number (294123).

2⁹⁸⁰⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

980405 is a deficient number, since it is larger than the sum of its proper divisors (196087).

980405 is a wasteful number, since it uses less digits than its factorization.

980405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196086.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 980405 is about 990.1540284218. The cubic root of 980405 is about 99.3425200078.

It can be divided in two parts, 980 and 405, that multiplied together give a square (396900 = 630²).

The spelling of 980405 in words is "nine hundred eighty thousand, four hundred five".