3421645 has 4 divisors (see below), whose sum is σ = 4105980. Its totient is φ = 2737312.

The previous prime is 3421637. The next prime is 3421657. The reversal of 3421645 is 5461243.

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 2669956 + 751689 = 1634^2 + 867^2 .

It is a cyclic number.

It is not a de Polignac number, because 3421645 - 2³ = 3421637 is a prime.

It is a super-3 number, since 3×3421645³ (a number of 21 digits) contains 333 as substring.

3421645 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342160 + ... + 342169.

It is an arithmetic number, because the mean of its divisors is an integer number (1026495).

Almost surely, 2^3421645 is an apocalyptic number.

It is an amenable number.

3421645 is a deficient number, since it is larger than the sum of its proper divisors (684335).

3421645 is an equidigital number, since it uses as much as digits as its factorization.

3421645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684334.

The product of its digits is 2880, while the sum is 25.

The square root of 3421645 is about 1849.7689044851. The cubic root of 3421645 is about 150.6878777100.

Adding to 3421645 its reverse (5461243), we get a palindrome (8882888).

The spelling of 3421645 in words is "three million, four hundred twenty-one thousand, six hundred forty-five".