53749 has 4 divisors (see below), whose sum is σ = 54720. Its totient is φ = 52780.

The previous prime is 53731. The next prime is 53759. The reversal of 53749 is 94735.

53749 is nontrivially palindromic in base 6.

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, and also an emirpimes, since its reverse is a distinct semiprime: 94735 = 5 ⋅18947.

It is a cyclic number.

It is not a de Polignac number, because 53749 - 2⁵ = 53717 is a prime.

It is a Duffinian number.

53749 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53719) 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, 397 + ... + 514.

It is an arithmetic number, because the mean of its divisors is an integer number (13680).

2⁵³⁷⁴⁹ is an apocalyptic number.

53749 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

It is an amenable number.

53749 is a deficient number, since it is larger than the sum of its proper divisors (971).

53749 is an equidigital number, since it uses as much as digits as its factorization.

53749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970.

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

The square root of 53749 is about 231.8383057219. The cubic root of 53749 is about 37.7389775284.

The spelling of 53749 in words is "fifty-three thousand, seven hundred forty-nine".