3405689 has 4 divisors (see below), whose sum is σ = 3892224. Its totient is φ = 2919156.

The previous prime is 3405671. The next prime is 3405697. The reversal of 3405689 is 9865043.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9865043 = 181 ⋅54503.

It is a cyclic number.

It is not a de Polignac number, because 3405689 - 2¹⁶ = 3340153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3405289) 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, 243257 + ... + 243270.

It is an arithmetic number, because the mean of its divisors is an integer number (973056).

Almost surely, 2^3405689 is an apocalyptic number.

It is an amenable number.

3405689 is a deficient number, since it is larger than the sum of its proper divisors (486535).

3405689 is an equidigital number, since it uses as much as digits as its factorization.

3405689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486534.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 3405689 is about 1845.4508934133. The cubic root of 3405689 is about 150.4532807161.

The spelling of 3405689 in words is "three million, four hundred five thousand, six hundred eighty-nine".