3645406 has 4 divisors (see below), whose sum is σ = 5468112. Its totient is φ = 1822702.

The previous prime is 3645391. The next prime is 3645407. The reversal of 3645406 is 6045463.

It is a semiprime because it is the product of two primes.

It is a d-powerful number, because it can be written as 3⁶ + 6⁵ + 4³ + 5⁹ + 4⁶ + 0 + 6⁸ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3645407) 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 as a sum of consecutive naturals, namely, 911350 + ... + 911353.

It is an arithmetic number, because the mean of its divisors is an integer number (1367028).

Almost surely, 2^3645406 is an apocalyptic number.

3645406 is a deficient number, since it is larger than the sum of its proper divisors (1822706).

3645406 is a wasteful number, since it uses less digits than its factorization.

3645406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822705.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 3645406 is about 1909.2946341516. The cubic root of 3645406 is about 153.9035489825.

The spelling of 3645406 in words is "three million, six hundred forty-five thousand, four hundred six".