55438187 has 4 divisors (see below), whose sum is σ = 63357936. Its totient is φ = 47518440.

The previous prime is 55438183. The next prime is 55438217. The reversal of 55438187 is 78183455.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55438187 - 2² = 55438183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55438183) 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 3 ways as a sum of consecutive naturals, for example, 3959864 + ... + 3959877.

It is an arithmetic number, because the mean of its divisors is an integer number (15839484).

Almost surely, 2^55438187 is an apocalyptic number.

55438187 is a deficient number, since it is larger than the sum of its proper divisors (7919749).

55438187 is an equidigital number, since it uses as much as digits as its factorization.

55438187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7919748.

The product of its digits is 134400, while the sum is 41.

The square root of 55438187 is about 7445.6824401797. The cubic root of 55438187 is about 381.3025178212.

The spelling of 55438187 in words is "fifty-five million, four hundred thirty-eight thousand, one hundred eighty-seven".