55185387 has 8 divisors (see below), whose sum is σ = 73663440. Its totient is φ = 36748800.

The previous prime is 55185359. The next prime is 55185397. The reversal of 55185387 is 78358155.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55185387 - 2⁶ = 55185323 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (55185307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7114 + ... + 12687.

It is an arithmetic number, because the mean of its divisors is an integer number (9207930).

Almost surely, 2^55185387 is an apocalyptic number.

55185387 is a deficient number, since it is larger than the sum of its proper divisors (18478053).

55185387 is a wasteful number, since it uses less digits than its factorization.

55185387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20733.

The product of its digits is 168000, while the sum is 42.

The square root of 55185387 is about 7428.6867614673. The cubic root of 55185387 is about 380.7220505001.

The spelling of 55185387 in words is "fifty-five million, one hundred eighty-five thousand, three hundred eighty-seven".