139401 has 10 divisors (see below), whose sum is σ = 208362. Its totient is φ = 92880.

The previous prime is 139397. The next prime is 139409. The reversal of 139401 is 104931.

It can be written as a sum of positive squares in only one way, i.e., 129600 + 9801 = 360^2 + 99^2 .

It is not a de Polignac number, because 139401 - 2² = 139397 is a prime.

139401 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139401.

It is not an unprimeable number, because it can be changed into a prime (139409) 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 9 ways as a sum of consecutive naturals, for example, 780 + ... + 941.

2¹³⁹⁴⁰¹ is an apocalyptic number.

It is an amenable number.

139401 is a deficient number, since it is larger than the sum of its proper divisors (68961).

139401 is an equidigital number, since it uses as much as digits as its factorization.

139401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1733 (or 1724 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 139401 is about 373.3644332284. The cubic root of 139401 is about 51.8507802941.

The spelling of 139401 in words is "one hundred thirty-nine thousand, four hundred one".