139542 has 16 divisors (see below), whose sum is σ = 300720. Its totient is φ = 42912.

The previous prime is 139537. The next prime is 139547. The reversal of 139542 is 245931.

It is an interprime number because it is at equal distance from previous prime (139537) and next prime (139547).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139542.

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

139542 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 817 + ... + 972.

It is an arithmetic number, because the mean of its divisors is an integer number (18795).

2¹³⁹⁵⁴² is an apocalyptic number.

139542 is an abundant number, since it is smaller than the sum of its proper divisors (161178).

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

139542 is a wasteful number, since it uses less digits than its factorization.

139542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1807.

The product of its digits is 1080, while the sum is 24.

The square root of 139542 is about 373.5532090613. The cubic root of 139542 is about 51.8682562482.

The spelling of 139542 in words is "one hundred thirty-nine thousand, five hundred forty-two".