3640995 has 12 divisors (see below), whose sum is σ = 6311136. Its totient is φ = 1941840.

The previous prime is 3640993. The next prime is 3640999. The reversal of 3640995 is 5990463.

3640995 is a `hidden beast` number, since 3 + 640 + 9 + 9 + 5 = 666.

It is not a de Polignac number, because 3640995 - 2¹ = 3640993 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (3640991) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 40411 + ... + 40500.

It is an arithmetic number, because the mean of its divisors is an integer number (525928).

Almost surely, 2^3640995 is an apocalyptic number.

3640995 is a deficient number, since it is larger than the sum of its proper divisors (2670141).

3640995 is a wasteful number, since it uses less digits than its factorization.

3640995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80922 (or 80919 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 3640995 is about 1908.1391458696. The cubic root of 3640995 is about 153.8414486702.

The spelling of 3640995 in words is "three million, six hundred forty thousand, nine hundred ninety-five".