3654865 has 4 divisors (see below), whose sum is σ = 4385844. Its totient is φ = 2923888.

The previous prime is 3654857. The next prime is 3654883. The reversal of 3654865 is 5684563.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5684563 = 31 ⋅183373.

It can be written as a sum of positive squares in 2 ways, for example, as 2715904 + 938961 = 1648^2 + 969^2 .

It is a cyclic number.

It is not a de Polignac number, because 3654865 - 2³ = 3654857 is a prime.

It is a Duffinian number.

3654865 is a lucky 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, 365482 + ... + 365491.

It is an arithmetic number, because the mean of its divisors is an integer number (1096461).

Almost surely, 2^3654865 is an apocalyptic number.

It is an amenable number.

3654865 is a deficient number, since it is larger than the sum of its proper divisors (730979).

3654865 is an equidigital number, since it uses as much as digits as its factorization.

3654865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730978.

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

The square root of 3654865 is about 1911.7701221643. The cubic root of 3654865 is about 154.0365489234.

The spelling of 3654865 in words is "three million, six hundred fifty-four thousand, eight hundred sixty-five".