139487 has 2 divisors, whose sum is σ = 139488. Its totient is φ = 139486.

The previous prime is 139483. The next prime is 139493. The reversal of 139487 is 784931.

139487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 139487 - 2² = 139483 is a prime.

It is a Chen 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 139487.

It is not a weakly prime, because it can be changed into another prime (139483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69743 + 69744.

It is an arithmetic number, because the mean of its divisors is an integer number (69744).

2¹³⁹⁴⁸⁷ is an apocalyptic number.

139487 is a deficient number, since it is larger than the sum of its proper divisors (1).

139487 is an equidigital number, since it uses as much as digits as its factorization.

139487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 139487 is about 373.4795844487. The cubic root of 139487 is about 51.8614407877.

It can be divided in two parts, 1394 and 87, that multiplied together give a triangular number (121278 = T₄₉₂).

The spelling of 139487 in words is "one hundred thirty-nine thousand, four hundred eighty-seven".