3663965 has 16 divisors (see below), whose sum is σ = 4593456. Its totient is φ = 2803200.

The previous prime is 3663949. The next prime is 3663971. The reversal of 3663965 is 5693663.

It can be written as a sum of positive squares in 8 ways, for example, as 502681 + 3161284 = 709^2 + 1778^2 .

It is not a de Polignac number, because 3663965 - 2⁴ = 3663949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12359 + ... + 12651.

It is an arithmetic number, because the mean of its divisors is an integer number (287091).

Almost surely, 2^3663965 is an apocalyptic number.

It is an amenable number.

3663965 is a deficient number, since it is larger than the sum of its proper divisors (929491).

3663965 is a wasteful number, since it uses less digits than its factorization.

3663965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400.

The product of its digits is 87480, while the sum is 38.

The square root of 3663965 is about 1914.1486358170. The cubic root of 3663965 is about 154.1642846803.

The spelling of 3663965 in words is "three million, six hundred sixty-three thousand, nine hundred sixty-five".