3409921 has 4 divisors (see below), whose sum is σ = 3413844. Its totient is φ = 3406000.

The previous prime is 3409891. The next prime is 3409927. The reversal of 3409921 is 1299043.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1299043 = 829 ⋅1567.

It can be written as a sum of positive squares in 2 ways, for example, as 1050625 + 2359296 = 1025^2 + 1536^2 .

It is a cyclic number.

It is not a de Polignac number, because 3409921 - 2⁹ = 3409409 is a prime.

It is a super-2 number, since 2×3409921² = 23255122452482, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

3409921 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3409921.

It is not an unprimeable number, because it can be changed into a prime (3409927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10 + ... + 2611.

It is an arithmetic number, because the mean of its divisors is an integer number (853461).

It is a Proth number, since it is equal to 1665 ⋅ 2¹¹ + 1 and 1665 < 2¹¹.

Almost surely, 2^3409921 is an apocalyptic number.

It is an amenable number.

3409921 is a deficient number, since it is larger than the sum of its proper divisors (3923).

3409921 is a wasteful number, since it uses less digits than its factorization.

3409921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3922.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 3409921 is about 1846.5971406888. The cubic root of 3409921 is about 150.5155740074.

The spelling of 3409921 in words is "three million, four hundred nine thousand, nine hundred twenty-one".