139689 has 24 divisors (see below), whose sum is σ = 235872. Its totient is φ = 78720.

The previous prime is 139681. The next prime is 139697. The reversal of 139689 is 986931.

It is an interprime number because it is at equal distance from previous prime (139681) and next prime (139697).

It is not a de Polignac number, because 139689 - 2³ = 139681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139681) 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, 1642 + ... + 1724.

It is an arithmetic number, because the mean of its divisors is an integer number (9828).

2¹³⁹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

139689 is a deficient number, since it is larger than the sum of its proper divisors (96183).

139689 is a wasteful number, since it uses less digits than its factorization.

139689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117 (or 114 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 139689 is about 373.7499163880. The cubic root of 139689 is about 51.8864633301.

It can be divided in two parts, 1396 and 89, that added together give a triangular number (1485 = T₅₄).

The spelling of 139689 in words is "one hundred thirty-nine thousand, six hundred eighty-nine".