139437 has 6 divisors (see below), whose sum is σ = 201422. Its totient is φ = 92952.

The previous prime is 139429. The next prime is 139439. The reversal of 139437 is 734931.

It can be written as a sum of positive squares in only one way, i.e., 84681 + 54756 = 291^2 + 234^2 .

It is not a de Polignac number, because 139437 - 2³ = 139429 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139437.

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 139437.

It is not an unprimeable number, because it can be changed into a prime (139439) 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 5 ways as a sum of consecutive naturals, for example, 7738 + ... + 7755.

2¹³⁹⁴³⁷ is an apocalyptic number.

It is an amenable number.

139437 is a deficient number, since it is larger than the sum of its proper divisors (61985).

139437 is a wasteful number, since it uses less digits than its factorization.

139437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15499 (or 15496 counting only the distinct ones).

The product of its digits is 2268, while the sum is 27.

The square root of 139437 is about 373.4126403859. The cubic root of 139437 is about 51.8552433597.

It can be divided in two parts, 1394 and 37, that added together give a triangular number (1431 = T₅₃).

The spelling of 139437 in words is "one hundred thirty-nine thousand, four hundred thirty-seven".