3980005 has 4 divisors (see below), whose sum is σ = 4776012. Its totient is φ = 3184000.

The previous prime is 3980003. The next prime is 3980017. The reversal of 3980005 is 5000893.

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 1313316 + 2666689 = 1146^2 + 1633^2 .

It is not a de Polignac number, because 3980005 - 2¹ = 3980003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3980003) 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, 397996 + ... + 398005.

It is an arithmetic number, because the mean of its divisors is an integer number (1194003).

Almost surely, 2^3980005 is an apocalyptic number.

It is an amenable number.

3980005 is a deficient number, since it is larger than the sum of its proper divisors (796007).

3980005 is an equidigital number, since it uses as much as digits as its factorization.

3980005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796006.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 3980005 is about 1994.9949874624. The cubic root of 3980005 is about 158.4751625442.

Adding to 3980005 its reverse (5000893), we get a palindrome (8980898).

The spelling of 3980005 in words is "three million, nine hundred eighty thousand, five".