139815 has 24 divisors (see below), whose sum is σ = 262080. Its totient is φ = 68544.

The previous prime is 139813. The next prime is 139831. The reversal of 139815 is 518931.

It is not a de Polignac number, because 139815 - 2¹ = 139813 is a prime.

Together with 122265 it forms an amicable pair .

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139813) 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 23 ways as a sum of consecutive naturals, for example, 466 + ... + 704.

It is an arithmetic number, because the mean of its divisors is an integer number (10920).

2¹³⁹⁸¹⁵ is an apocalyptic number.

139815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

139815 is a deficient number, since it is larger than the sum of its proper divisors (122265).

139815 is a wasteful number, since it uses less digits than its factorization.

139815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 260 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 139815 is about 373.9184403048. The cubic root of 139815 is about 51.9020592365.

The spelling of 139815 in words is "one hundred thirty-nine thousand, eight hundred fifteen".