55555439 has 4 divisors (see below), whose sum is σ = 58823424. Its totient is φ = 52287456.

The previous prime is 55555429. The next prime is 55555459. The reversal of 55555439 is 93455555.

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-55555439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55555396 and 55555405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55555429) 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, 1633967 + ... + 1634000.

It is an arithmetic number, because the mean of its divisors is an integer number (14705856).

Almost surely, 2^55555439 is an apocalyptic number.

55555439 is a deficient number, since it is larger than the sum of its proper divisors (3267985).

55555439 is a wasteful number, since it uses less digits than its factorization.

55555439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3267984.

The product of its digits is 337500, while the sum is 41.

The square root of 55555439 is about 7453.5521062108. The cubic root of 55555439 is about 381.5711473386.

The spelling of 55555439 in words is "fifty-five million, five hundred fifty-five thousand, four hundred thirty-nine".