139287 has 8 divisors (see below), whose sum is σ = 192240. Its totient is φ = 89600.

The previous prime is 139273. The next prime is 139291. The reversal of 139287 is 782931.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139287 - 2¹¹ = 137239 is a prime.

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 139287.

It is not an unprimeable number, because it can be changed into a prime (139267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 714 + ... + 887.

It is an arithmetic number, because the mean of its divisors is an integer number (24030).

2¹³⁹²⁸⁷ is an apocalyptic number.

139287 is a deficient number, since it is larger than the sum of its proper divisors (52953).

139287 is a wasteful number, since it uses less digits than its factorization.

139287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633.

The product of its digits is 3024, while the sum is 30.

The square root of 139287 is about 373.2117361499. The cubic root of 139287 is about 51.8366421817.

Adding to 139287 its product of digits (3024), we get a triangular number (142311 = T₅₃₃).

It can be divided in two parts, 1392 and 87, that multiplied together give a square (121104 = 348²).

The spelling of 139287 in words is "one hundred thirty-nine thousand, two hundred eighty-seven".