280074869 has 2 divisors, whose sum is σ = 280074870. Its totient is φ = 280074868.

The previous prime is 280074857. The next prime is 280074871. The reversal of 280074869 is 968470082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231952900 + 48121969 = 15230^2 + 6937^2 .

It is a cyclic number.

It is not a de Polignac number, because 280074869 - 2¹⁶ = 280009333 is a prime.

It is a super-2 number, since 2×280074869² = 156883864490734322, which contains 22 as substring.

Together with 280074871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280074469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140037434 + 140037435.

It is an arithmetic number, because the mean of its divisors is an integer number (140037435).

Almost surely, 2^280074869 is an apocalyptic number.

It is an amenable number.

280074869 is a deficient number, since it is larger than the sum of its proper divisors (1).

280074869 is an equidigital number, since it uses as much as digits as its factorization.

280074869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 280074869 is about 16735.4375204235. The cubic root of 280074869 is about 654.2715667136.

The spelling of 280074869 in words is "two hundred eighty million, seventy-four thousand, eight hundred sixty-nine".