32640409 has 4 divisors (see below), whose sum is σ = 32726016. Its totient is φ = 32554804.

The previous prime is 32640407. The next prime is 32640431. The reversal of 32640409 is 90404623.

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 32640409 - 2¹ = 32640407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (32640407) 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 3 ways as a sum of consecutive naturals, for example, 42229 + ... + 42994.

It is an arithmetic number, because the mean of its divisors is an integer number (8181504).

Almost surely, 2^32640409 is an apocalyptic number.

It is an amenable number.

32640409 is a deficient number, since it is larger than the sum of its proper divisors (85607).

32640409 is an equidigital number, since it uses as much as digits as its factorization.

32640409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85606.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 32640409 is about 5713.1785373818. The cubic root of 32640409 is about 319.5841244713.

The spelling of 32640409 in words is "thirty-two million, six hundred forty thousand, four hundred nine".