40649 has 4 divisors (see below), whose sum is σ = 46464. Its totient is φ = 34836.

The previous prime is 40639. The next prime is 40693. The reversal of 40649 is 94604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40649 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (40609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2897 + ... + 2910.

It is an arithmetic number, because the mean of its divisors is an integer number (11616).

2⁴⁰⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

40649 is a deficient number, since it is larger than the sum of its proper divisors (5815).

40649 is an equidigital number, since it uses as much as digits as its factorization.

40649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5814.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 40649 is about 201.6159715896. The cubic root of 40649 is about 34.3834899140.

The spelling of 40649 in words is "forty thousand, six hundred forty-nine".