139539 has 8 divisors (see below), whose sum is σ = 187792. Its totient is φ = 92160.

The previous prime is 139537. The next prime is 139547. The reversal of 139539 is 935931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 139539 - 2¹ = 139537 is a prime.

It is a super-2 number, since 2×139539² = 38942265042, which contains 22 as substring.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 459 + ... + 699.

It is an arithmetic number, because the mean of its divisors is an integer number (23474).

2¹³⁹⁵³⁹ is an apocalyptic number.

139539 is a deficient number, since it is larger than the sum of its proper divisors (48253).

139539 is a wasteful number, since it uses less digits than its factorization.

139539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437.

The product of its digits is 3645, while the sum is 30.

The square root of 139539 is about 373.5491935475. The cubic root of 139539 is about 51.8678845420.

The spelling of 139539 in words is "one hundred thirty-nine thousand, five hundred thirty-nine".