139678 has 16 divisors (see below), whose sum is σ = 261504. Its totient is φ = 54360.

The previous prime is 139663. The next prime is 139681. The reversal of 139678 is 876931.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

139678 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300 + ... + 607.

It is an arithmetic number, because the mean of its divisors is an integer number (16344).

2¹³⁹⁶⁷⁸ is an apocalyptic number.

139678 is a deficient number, since it is larger than the sum of its proper divisors (121826).

139678 is a wasteful number, since it uses less digits than its factorization.

139678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927.

The product of its digits is 9072, while the sum is 34.

The square root of 139678 is about 373.7352003759. The cubic root of 139678 is about 51.8851013377.

The spelling of 139678 in words is "one hundred thirty-nine thousand, six hundred seventy-eight".