280239293 has 2 divisors, whose sum is σ = 280239294. Its totient is φ = 280239292.

The previous prime is 280239283. The next prime is 280239317. The reversal of 280239293 is 392932082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 267551449 + 12687844 = 16357^2 + 3562^2 .

It is a cyclic number.

It is not a de Polignac number, because 280239293 - 2⁴ = 280239277 is a prime.

It is a super-2 number, since 2×280239293² = 157068122682279698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280239233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140119646 + 140119647.

It is an arithmetic number, because the mean of its divisors is an integer number (140119647).

Almost surely, 2^280239293 is an apocalyptic number.

It is an amenable number.

280239293 is a deficient number, since it is larger than the sum of its proper divisors (1).

280239293 is an equidigital number, since it uses as much as digits as its factorization.

280239293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 280239293 is about 16740.3492496423. The cubic root of 280239293 is about 654.3995764173.

The spelling of 280239293 in words is "two hundred eighty million, two hundred thirty-nine thousand, two hundred ninety-three".