3658645 has 4 divisors (see below), whose sum is σ = 4390380. Its totient is φ = 2926912.

The previous prime is 3658639. The next prime is 3658661. The reversal of 3658645 is 5468563.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5468563 = 37 ⋅147799.

It can be written as a sum of positive squares in 2 ways, for example, as 1168561 + 2490084 = 1081^2 + 1578^2 .

It is a cyclic number.

It is not a de Polignac number, because 3658645 - 2³ = 3658637 is a prime.

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, 365860 + ... + 365869.

It is an arithmetic number, because the mean of its divisors is an integer number (1097595).

Almost surely, 2^3658645 is an apocalyptic number.

It is an amenable number.

3658645 is a deficient number, since it is larger than the sum of its proper divisors (731735).

3658645 is an equidigital number, since it uses as much as digits as its factorization.

3658645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731734.

The product of its digits is 86400, while the sum is 37.

The square root of 3658645 is about 1912.7584792650. The cubic root of 3658645 is about 154.0896341070.

The spelling of 3658645 in words is "three million, six hundred fifty-eight thousand, six hundred forty-five".