139747 has 2 divisors, whose sum is σ = 139748. Its totient is φ = 139746.

The previous prime is 139739. The next prime is 139753. The reversal of 139747 is 747931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139747 - 2³ = 139739 is a prime.

It is a d-powerful number, because it can be written as 1 + 3⁹ + 7⁴ + 9 + 4 + 7⁶ .

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (139787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69873 + 69874.

It is an arithmetic number, because the mean of its divisors is an integer number (69874).

2¹³⁹⁷⁴⁷ is an apocalyptic number.

139747 is a deficient number, since it is larger than the sum of its proper divisors (1).

139747 is an equidigital number, since it uses as much as digits as its factorization.

139747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 31.

The square root of 139747 is about 373.8275003260. The cubic root of 139747 is about 51.8936435625.

It can be divided in two parts, 1397 and 47, that added together give a square (1444 = 38²).

The spelling of 139747 in words is "one hundred thirty-nine thousand, seven hundred forty-seven".