55388209 has 8 divisors (see below), whose sum is σ = 57871872. Its totient is φ = 52910880.

The previous prime is 55388189. The next prime is 55388219. The reversal of 55388209 is 90288355.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55388209 - 2⁹ = 55387697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55388219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29472 + ... + 31294.

It is an arithmetic number, because the mean of its divisors is an integer number (7233984).

Almost surely, 2^55388209 is an apocalyptic number.

It is an amenable number.

55388209 is a deficient number, since it is larger than the sum of its proper divisors (2483663).

55388209 is a wasteful number, since it uses less digits than its factorization.

55388209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3167.

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 55388209 is about 7442.3255102152. The cubic root of 55388209 is about 381.1879008773.

The spelling of 55388209 in words is "fifty-five million, three hundred eighty-eight thousand, two hundred nine".