55439905 has 8 divisors (see below), whose sum is σ = 66673152. Its totient is φ = 44255088.

The previous prime is 55439899. The next prime is 55439953. The reversal of 55439905 is 50993455.

It is a happy number.

55439905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 55439905 - 2³ = 55439897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9537 + ... + 14206.

It is an arithmetic number, because the mean of its divisors is an integer number (8334144).

Almost surely, 2^55439905 is an apocalyptic number.

It is an amenable number.

55439905 is a deficient number, since it is larger than the sum of its proper divisors (11233247).

55439905 is a wasteful number, since it uses less digits than its factorization.

55439905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24215.

The product of its (nonzero) digits is 121500, while the sum is 40.

The square root of 55439905 is about 7445.7978081600. The cubic root of 55439905 is about 381.3064565681.

The spelling of 55439905 in words is "fifty-five million, four hundred thirty-nine thousand, nine hundred five".