55399329 has 16 divisors (see below), whose sum is σ = 82218240. Its totient is φ = 36867600.

The previous prime is 55399327. The next prime is 55399343. The reversal of 55399329 is 92399355.

55399329 is a `hidden beast` number, since 5 + 539 + 93 + 29 = 666.

55399329 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55399329 - 2¹ = 55399327 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55399321) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 17464 + ... + 20390.

It is an arithmetic number, because the mean of its divisors is an integer number (5138640).

Almost surely, 2^55399329 is an apocalyptic number.

It is an amenable number.

55399329 is a deficient number, since it is larger than the sum of its proper divisors (26818911).

55399329 is a wasteful number, since it uses less digits than its factorization.

55399329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3637 (or 3631 counting only the distinct ones).

The product of its digits is 328050, while the sum is 45.

The square root of 55399329 is about 7443.0725510370. The cubic root of 55399329 is about 381.2134088684.

The spelling of 55399329 in words is "fifty-five million, three hundred ninety-nine thousand, three hundred twenty-nine".