3640869 has 12 divisors (see below), whose sum is σ = 5454176. Its totient is φ = 2427084.

The previous prime is 3640867. The next prime is 3640891. The reversal of 3640869 is 9680463.

3640869 is a `hidden beast` number, since 3 + 640 + 8 + 6 + 9 = 666.

It is not a de Polignac number, because 3640869 - 2¹ = 3640867 is a prime.

It is a super-2 number, since 2×3640869² = 26511854150322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

3640869 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7249 + ... + 7734.

Almost surely, 2^3640869 is an apocalyptic number.

It is an amenable number.

3640869 is a deficient number, since it is larger than the sum of its proper divisors (1813307).

3640869 is an equidigital number, since it uses as much as digits as its factorization.

3640869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14998 (or 14986 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 3640869 is about 1908.1061291238. The cubic root of 3640869 is about 153.8396740412.

It can be divided in two parts, 36408 and 69, that multiplied together give a palindrome (2512152).

The spelling of 3640869 in words is "three million, six hundred forty thousand, eight hundred sixty-nine".