3402405 has 40 divisors (see below), whose sum is σ = 6319104. Its totient is φ = 1749600.

The previous prime is 3402403. The next prime is 3402407. The reversal of 3402405 is 5042043.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3402403) and next prime (3402407).

It is not a de Polignac number, because 3402405 - 2¹ = 3402403 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3402403) 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 39 ways as a sum of consecutive naturals, for example, 12420 + ... + 12690.

Almost surely, 2^3402405 is an apocalyptic number.

It is an amenable number.

3402405 is a deficient number, since it is larger than the sum of its proper divisors (2916699).

3402405 is a wasteful number, since it uses less digits than its factorization.

3402405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 3402405 is about 1844.5609233636. The cubic root of 3402405 is about 150.4049060239.

Adding to 3402405 its reverse (5042043), we get a palindrome (8444448).

The spelling of 3402405 in words is "three million, four hundred two thousand, four hundred five".