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139015 = 527803
BaseRepresentation
bin100001111100000111
321001200201
4201330013
513422030
62551331
71116202
oct417407
9231621
10139015
1195498
1268547
134b376
1438939
152b2ca
hex21f07

139015 has 4 divisors (see below), whose sum is σ = 166824. Its totient is φ = 111208.

The previous prime is 138977. The next prime is 139021. The reversal of 139015 is 510931.

139015 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-139015 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138983 and 139001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13897 + ... + 13906.

It is an arithmetic number, because the mean of its divisors is an integer number (41706).

2139015 is an apocalyptic number.

139015 is a deficient number, since it is larger than the sum of its proper divisors (27809).

139015 is an equidigital number, since it uses as much as digits as its factorization.

139015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27808.

The product of its (nonzero) digits is 135, while the sum is 19.

The square root of 139015 is about 372.8471536702. The cubic root of 139015 is about 51.8028779526.

Adding to 139015 its reverse (510931), we get a palindrome (649946).

The spelling of 139015 in words is "one hundred thirty-nine thousand, fifteen".

Divisors: 1 5 27803 139015