3400405 has 4 divisors (see below), whose sum is σ = 4080492. Its totient is φ = 2720320.

The previous prime is 3400399. The next prime is 3400409. The reversal of 3400405 is 5040043.

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 2125764 + 1274641 = 1458^2 + 1129^2 .

It is not a de Polignac number, because 3400405 - 2¹¹ = 3398357 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 (3400409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340036 + ... + 340045.

It is an arithmetic number, because the mean of its divisors is an integer number (1020123).

Almost surely, 2^3400405 is an apocalyptic number.

It is an amenable number.

3400405 is a deficient number, since it is larger than the sum of its proper divisors (680087).

3400405 is an equidigital number, since it uses as much as digits as its factorization.

3400405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680086.

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 3400405 is about 1844.0187092326. The cubic root of 3400405 is about 150.3754299355.

Adding to 3400405 its reverse (5040043), we get a palindrome (8440448).

The spelling of 3400405 in words is "three million, four hundred thousand, four hundred five".