280984409 has 2 divisors, whose sum is σ = 280984410. Its totient is φ = 280984408.

The previous prime is 280984387. The next prime is 280984423. The reversal of 280984409 is 904489082.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212343184 + 68641225 = 14572^2 + 8285^2 .

It is a cyclic number.

It is not a de Polignac number, because 280984409 - 2⁸ = 280984153 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 280984409.

It is not a weakly prime, because it can be changed into another prime (280984009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140492204 + 140492205.

It is an arithmetic number, because the mean of its divisors is an integer number (140492205).

Almost surely, 2^280984409 is an apocalyptic number.

It is an amenable number.

280984409 is a deficient number, since it is larger than the sum of its proper divisors (1).

280984409 is an equidigital number, since it uses as much as digits as its factorization.

280984409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 280984409 is about 16762.5895672477. The cubic root of 280984409 is about 654.9790479478.

The spelling of 280984409 in words is "two hundred eighty million, nine hundred eighty-four thousand, four hundred nine".