57439 has 4 divisors (see below), whose sum is σ = 58320. Its totient is φ = 56560.

The previous prime is 57427. The next prime is 57457. The reversal of 57439 is 93475.

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 57439 - 2¹⁵ = 24671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57139) 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, 334 + ... + 475.

It is an arithmetic number, because the mean of its divisors is an integer number (14580).

2⁵⁷⁴³⁹ is an apocalyptic number.

57439 is a deficient number, since it is larger than the sum of its proper divisors (881).

57439 is an equidigital number, since it uses as much as digits as its factorization.

57439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880.

The product of its digits is 3780, while the sum is 28.

The square root of 57439 is about 239.6643486211. The cubic root of 57439 is about 38.5835594478.

It can be divided in two parts, 57 and 439, that added together give a triangular number (496 = T₃₁).

The spelling of 57439 in words is "fifty-seven thousand, four hundred thirty-nine".