139533 has 4 divisors (see below), whose sum is σ = 186048. Its totient is φ = 93020.

The previous prime is 139511. The next prime is 139537. The reversal of 139533 is 335931.

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: 335931 = 3 ⋅111977.

It is a cyclic number.

It is not a de Polignac number, because 139533 - 2⁵ = 139501 is a prime.

It is a D-number.

139533 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139537) 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, 23253 + ... + 23258.

It is an arithmetic number, because the mean of its divisors is an integer number (46512).

2¹³⁹⁵³³ is an apocalyptic number.

It is an amenable number.

139533 is a deficient number, since it is larger than the sum of its proper divisors (46515).

139533 is an equidigital number, since it uses as much as digits as its factorization.

139533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46514.

The product of its digits is 1215, while the sum is 24.

The square root of 139533 is about 373.5411623904. The cubic root of 139533 is about 51.8671411136.

The spelling of 139533 in words is "one hundred thirty-nine thousand, five hundred thirty-three".