280228139 has 2 divisors, whose sum is σ = 280228140. Its totient is φ = 280228138.

The previous prime is 280228097. The next prime is 280228213. The reversal of 280228139 is 931822082.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280228139 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 280228099 and 280228108.

It is not a weakly prime, because it can be changed into another prime (280227139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140114069 + 140114070.

It is an arithmetic number, because the mean of its divisors is an integer number (140114070).

Almost surely, 2^280228139 is an apocalyptic number.

280228139 is a deficient number, since it is larger than the sum of its proper divisors (1).

280228139 is an equidigital number, since it uses as much as digits as its factorization.

280228139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 280228139 is about 16740.0160991559. The cubic root of 280228139 is about 654.3908942304.

The spelling of 280228139 in words is "two hundred eighty million, two hundred twenty-eight thousand, one hundred thirty-nine".