55999389 has 16 divisors (see below), whose sum is σ = 76902272. Its totient is φ = 36220608.

The previous prime is 55999381. The next prime is 55999393. The reversal of 55999389 is 98399955.

It is not a de Polignac number, because 55999389 - 2³ = 55999381 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55999381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67632 + ... + 68454.

It is an arithmetic number, because the mean of its divisors is an integer number (4806392).

Almost surely, 2^55999389 is an apocalyptic number.

It is an amenable number.

55999389 is a deficient number, since it is larger than the sum of its proper divisors (20902883).

55999389 is a wasteful number, since it uses less digits than its factorization.

55999389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476.

The product of its digits is 3936600, while the sum is 57.

The square root of 55999389 is about 7483.2739492818. The cubic root of 55999389 is about 382.5848451197.

The spelling of 55999389 in words is "fifty-five million, nine hundred ninety-nine thousand, three hundred eighty-nine".