32445821 has 4 divisors (see below), whose sum is σ = 32780412. Its totient is φ = 32111232.

The previous prime is 32445817. The next prime is 32445851. The reversal of 32445821 is 12854423.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12854423 = 3449 ⋅3727.

It can be written as a sum of positive squares in 2 ways, for example, as 6180196 + 26265625 = 2486^2 + 5125^2 .

It is a cyclic number.

It is not a de Polignac number, because 32445821 - 2² = 32445817 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32445851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167150 + ... + 167343.

It is an arithmetic number, because the mean of its divisors is an integer number (8195103).

Almost surely, 2^32445821 is an apocalyptic number.

It is an amenable number.

32445821 is a deficient number, since it is larger than the sum of its proper divisors (334591).

32445821 is an equidigital number, since it uses as much as digits as its factorization.

32445821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334590.

The product of its digits is 7680, while the sum is 29.

The square root of 32445821 is about 5696.1233308277. The cubic root of 32445821 is about 318.9477841573.

The spelling of 32445821 in words is "thirty-two million, four hundred forty-five thousand, eight hundred twenty-one".