55389940 has 48 divisors (see below), whose sum is σ = 124225920. Its totient is φ = 20684160.

The previous prime is 55389937. The next prime is 55389953. The reversal of 55389940 is 4998355.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25954 + ... + 28006.

It is an arithmetic number, because the mean of its divisors is an integer number (2588040).

Almost surely, 2^55389940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55389940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62112960).

55389940 is an abundant number, since it is smaller than the sum of its proper divisors (68835980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55389940 is a wasteful number, since it uses less digits than its factorization.

55389940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152 (or 2150 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The square root of 55389940 is about 7442.4418036018. The cubic root of 55389940 is about 381.1918718150.

The spelling of 55389940 in words is "fifty-five million, three hundred eighty-nine thousand, nine hundred forty".