55440403 has 4 divisors (see below), whose sum is σ = 55474128. Its totient is φ = 55406680.

The previous prime is 55440391. The next prime is 55440439. The reversal of 55440403 is 30404455.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55440403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55140403) 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, 14263 + ... + 17728.

It is an arithmetic number, because the mean of its divisors is an integer number (13868532).

Almost surely, 2^55440403 is an apocalyptic number.

55440403 is a deficient number, since it is larger than the sum of its proper divisors (33725).

55440403 is a wasteful number, since it uses less digits than its factorization.

55440403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33724.

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 55440403 is about 7445.8312497665. The cubic root of 55440403 is about 381.3075982851.

Adding to 55440403 its reverse (30404455), we get a palindrome (85844858).

The spelling of 55440403 in words is "fifty-five million, four hundred forty thousand, four hundred three".