139540 has 12 divisors (see below), whose sum is σ = 293076. Its totient is φ = 55808.

The previous prime is 139537. The next prime is 139547. The reversal of 139540 is 45931.

It can be written as a sum of positive squares in 2 ways, for example, as 38416 + 101124 = 196^2 + 318^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3469 + ... + 3508.

It is an arithmetic number, because the mean of its divisors is an integer number (24423).

2¹³⁹⁵⁴⁰ is an apocalyptic number.

139540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139540 is an abundant number, since it is smaller than the sum of its proper divisors (153536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139540 is a wasteful number, since it uses less digits than its factorization.

139540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6986 (or 6984 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 139540 is about 373.5505320569. The cubic root of 139540 is about 51.8680084447.

The spelling of 139540 in words is "one hundred thirty-nine thousand, five hundred forty".