55240403 has 4 divisors (see below), whose sum is σ = 55259928. Its totient is φ = 55220880.

The previous prime is 55240321. The next prime is 55240417. The reversal of 55240403 is 30404255.

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

It is a cyclic number.

It is not a de Polignac number, because 55240403 - 2⁸ = 55240147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55240453) 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, 4613 + ... + 11478.

It is an arithmetic number, because the mean of its divisors is an integer number (13814982).

Almost surely, 2^55240403 is an apocalyptic number.

55240403 is a deficient number, since it is larger than the sum of its proper divisors (19525).

55240403 is a wasteful number, since it uses less digits than its factorization.

55240403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19524.

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 55240403 is about 7432.3887815426. The cubic root of 55240403 is about 380.8485262988.

Adding to 55240403 its reverse (30404255), we get a palindrome (85644658).

The spelling of 55240403 in words is "fifty-five million, two hundred forty thousand, four hundred three".