55391386 has 8 divisors (see below), whose sum is σ = 83518164. Its totient is φ = 27552000.

The previous prime is 55391377. The next prime is 55391407. The reversal of 55391386 is 68319355.

55391386 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 47183161 + 8208225 = 6869^2 + 2865^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 71365 + ... + 72136.

Almost surely, 2^55391386 is an apocalyptic number.

55391386 is a deficient number, since it is larger than the sum of its proper divisors (28126778).

55391386 is a wasteful number, since it uses less digits than its factorization.

55391386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143696.

The product of its digits is 97200, while the sum is 40.

The square root of 55391386 is about 7442.5389485041. The cubic root of 55391386 is about 381.1951888954.

The spelling of 55391386 in words is "fifty-five million, three hundred ninety-one thousand, three hundred eighty-six".