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55387 = 97571
BaseRepresentation
bin1101100001011011
32210222101
431201123
53233022
61104231
7320323
oct154133
983871
1055387
1138682
1228077
131c297
1416283
1511627
hexd85b

55387 has 4 divisors (see below), whose sum is σ = 56056. Its totient is φ = 54720.

The previous prime is 55381. The next prime is 55399. The reversal of 55387 is 78355.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78355 = 515671.

It is a cyclic number.

It is not a de Polignac number, because 55387 - 27 = 55259 is a prime.

It is an Ulam number.

It is a Duffinian number.

55387 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (55381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189 + ... + 382.

It is an arithmetic number, because the mean of its divisors is an integer number (14014).

255387 is an apocalyptic number.

55387 is a deficient number, since it is larger than the sum of its proper divisors (669).

55387 is an equidigital number, since it uses as much as digits as its factorization.

55387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668.

The product of its digits is 4200, while the sum is 28.

The square root of 55387 is about 235.3444284448. The cubic root of 55387 is about 38.1185127366.

The spelling of 55387 in words is "fifty-five thousand, three hundred eighty-seven".

Divisors: 1 97 571 55387