40320055 has 4 divisors (see below), whose sum is σ = 48384072. Its totient is φ = 32256040.

The previous prime is 40320053. The next prime is 40320067. The reversal of 40320055 is 55002304.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 40320055 - 2¹ = 40320053 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 (40320053) 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, 4032001 + ... + 4032010.

It is an arithmetic number, because the mean of its divisors is an integer number (12096018).

Almost surely, 2^40320055 is an apocalyptic number.

40320055 is a deficient number, since it is larger than the sum of its proper divisors (8064017).

40320055 is an equidigital number, since it uses as much as digits as its factorization.

40320055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8064016.

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 40320055 is about 6349.8074773965. The cubic root of 40320055 is about 342.9049112098.

Adding to 40320055 its reverse (55002304), we get a palindrome (95322359).

The spelling of 40320055 in words is "forty million, three hundred twenty thousand, fifty-five".