55439388 has 18 divisors (see below), whose sum is σ = 140138544. Its totient is φ = 18479784.

The previous prime is 55439383. The next prime is 55439389. The reversal of 55439388 is 88393455.

It is a happy number.

55439388 is a `hidden beast` number, since 554 + 3 + 93 + 8 + 8 = 666.

55439388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55439381) 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 5 ways as a sum of consecutive naturals, for example, 769956 + ... + 770027.

Almost surely, 2^55439388 is an apocalyptic number.

It is an amenable number.

55439388 is an abundant number, since it is smaller than the sum of its proper divisors (84699156).

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

55439388 is a wasteful number, since it uses less digits than its factorization.

55439388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539993 (or 1539988 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 55439388 is about 7445.7630905099. The cubic root of 55439388 is about 381.3052712844.

The spelling of 55439388 in words is "fifty-five million, four hundred thirty-nine thousand, three hundred eighty-eight".