139881 has 8 divisors (see below), whose sum is σ = 213184. Its totient is φ = 79920.

The previous prime is 139871. The next prime is 139883. The reversal of 139881 is 188931.

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

It is not a de Polignac number, because 139881 - 2⁷ = 139753 is a prime.

It is a super-2 number, since 2×139881² = 39133388322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139881.

It is not an unprimeable number, because it can be changed into a prime (139883) 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 7 ways as a sum of consecutive naturals, for example, 3310 + ... + 3351.

It is an arithmetic number, because the mean of its divisors is an integer number (26648).

2¹³⁹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

139881 is a deficient number, since it is larger than the sum of its proper divisors (73303).

139881 is an equidigital number, since it uses as much as digits as its factorization.

139881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6671.

The product of its digits is 1728, while the sum is 30.

The square root of 139881 is about 374.0066844322. The cubic root of 139881 is about 51.9102247815.

The spelling of 139881 in words is "one hundred thirty-nine thousand, eight hundred eighty-one".