40669 has 4 divisors (see below), whose sum is σ = 41344. Its totient is φ = 39996.

The previous prime is 40639. The next prime is 40693. The reversal of 40669 is 96604.

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 not a de Polignac number, because 40669 - 2⁵ = 40637 is a prime.

It is a super-2 number, since 2×40669² = 3307935122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237 + ... + 370.

It is an arithmetic number, because the mean of its divisors is an integer number (10336).

2⁴⁰⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

40669 is a deficient number, since it is larger than the sum of its proper divisors (675).

40669 is an equidigital number, since it uses as much as digits as its factorization.

40669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 40669 is about 201.6655647353. The cubic root of 40669 is about 34.3891280769.

The spelling of 40669 in words is "forty thousand, six hundred sixty-nine".