139604 has 12 divisors (see below), whose sum is σ = 258804. Its totient is φ = 65664.

The previous prime is 139597. The next prime is 139609. The reversal of 139604 is 406931.

Added to its reverse (406931) it gives a triangular number (546535 = T₁₀₄₅).

139604 = T₂₇ + T₂₈ + ... + T₉₄.

It can be written as a sum of positive squares in 2 ways, for example, as 91204 + 48400 = 302^2 + 220^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 139604.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139604.

It is not an unprimeable number, because it can be changed into a prime (139609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 959 + ... + 1094.

It is an arithmetic number, because the mean of its divisors is an integer number (21567).

2¹³⁹⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

139604 is a deficient number, since it is larger than the sum of its proper divisors (119200).

139604 is a wasteful number, since it uses less digits than its factorization.

139604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2074 (or 2072 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 139604 is about 373.6361866843. The cubic root of 139604 is about 51.8759369841.

Adding to 139604 its reverse (406931), we get a triangular number (546535 = T₁₀₄₅).

The spelling of 139604 in words is "one hundred thirty-nine thousand, six hundred four".