139878 has 24 divisors (see below), whose sum is σ = 319800. Its totient is φ = 44064.

The previous prime is 139871. The next prime is 139883. The reversal of 139878 is 878931.

It is a plaindrome in base 16.

It is a zygodrome in base 16.

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 139878.

It is not an unprimeable number, because it can be changed into a prime (139871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138 + ... + 546.

It is an arithmetic number, because the mean of its divisors is an integer number (13325).

2¹³⁹⁸⁷⁸ is an apocalyptic number.

139878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 139878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159900).

139878 is an abundant number, since it is smaller than the sum of its proper divisors (179922).

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

139878 is a wasteful number, since it uses less digits than its factorization.

139878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 433 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 139878 is about 374.0026737872. The cubic root of 139878 is about 51.9098536761.

The spelling of 139878 in words is "one hundred thirty-nine thousand, eight hundred seventy-eight".