3646385 has 16 divisors (see below), whose sum is σ = 4656960. Its totient is φ = 2733120.

The previous prime is 3646369. The next prime is 3646393. The reversal of 3646385 is 5836463.

It is not a de Polignac number, because 3646385 - 2⁴ = 3646369 is a prime.

It is a super-2 number, since 2×3646385² = 26592247136450, which contains 22 as substring.

It is an Ulam number.

It is a d-powerful number, because it can be written as 3⁸ + 6 + 4 + 6⁸ + 3⁸ + 8³ + 5⁹ .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12299 + ... + 12591.

It is an arithmetic number, because the mean of its divisors is an integer number (291060).

Almost surely, 2^3646385 is an apocalyptic number.

It is an amenable number.

3646385 is a deficient number, since it is larger than the sum of its proper divisors (1010575).

3646385 is a wasteful number, since it uses less digits than its factorization.

3646385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448.

The product of its digits is 51840, while the sum is 35.

The square root of 3646385 is about 1909.5509943440. The cubic root of 3646385 is about 153.9173250510.

Subtracting from 3646385 its sum of digits (35), we obtain a triangular number (3646350 = T₂₇₀₀).

The spelling of 3646385 in words is "three million, six hundred forty-six thousand, three hundred eighty-five".