55397 has 4 divisors (see below), whose sum is σ = 57216. Its totient is φ = 53580.

The previous prime is 55381. The next prime is 55399. The reversal of 55397 is 79355.

55397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55397 - 2⁴ = 55381 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55399) 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, 863 + ... + 924.

It is an arithmetic number, because the mean of its divisors is an integer number (14304).

2⁵⁵³⁹⁷ is an apocalyptic number.

It is an amenable number.

55397 is a deficient number, since it is larger than the sum of its proper divisors (1819).

55397 is a wasteful number, since it uses less digits than its factorization.

55397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818.

The product of its digits is 4725, while the sum is 29.

The square root of 55397 is about 235.3656729432. The cubic root of 55397 is about 38.1208066695.

The spelling of 55397 in words is "fifty-five thousand, three hundred ninety-seven".