3645421 has 8 divisors (see below), whose sum is σ = 3991064. Its totient is φ = 3309120.

The previous prime is 3645419. The next prime is 3645449. The reversal of 3645421 is 1245463.

It can be written as a sum of positive squares in 4 ways, for example, as 455625 + 3189796 = 675^2 + 1786^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3645421 - 2¹ = 3645419 is a prime.

It is a super-3 number, since 3×3645421³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3645121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1506 + ... + 3091.

It is an arithmetic number, because the mean of its divisors is an integer number (498883).

Almost surely, 2^3645421 is an apocalyptic number.

It is an amenable number.

3645421 is a deficient number, since it is larger than the sum of its proper divisors (345643).

3645421 is a wasteful number, since it uses less digits than its factorization.

3645421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4671.

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

The square root of 3645421 is about 1909.2985622998. The cubic root of 3645421 is about 153.9037600746.

The spelling of 3645421 in words is "three million, six hundred forty-five thousand, four hundred twenty-one".