280139 has 2 divisors, whose sum is σ = 280140. Its totient is φ = 280138.

The previous prime is 280129. The next prime is 280183. The reversal of 280139 is 931082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 280139 - 2⁸ = 279883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (280129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140069 + 140070.

It is an arithmetic number, because the mean of its divisors is an integer number (140070).

2²⁸⁰¹³⁹ is an apocalyptic number.

280139 is a deficient number, since it is larger than the sum of its proper divisors (1).

280139 is an equidigital number, since it uses as much as digits as its factorization.

280139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 280139 is about 529.2815885708. The cubic root of 280139 is about 65.4321500847.

The spelling of 280139 in words is "two hundred eighty thousand, one hundred thirty-nine".