280469639 has 2 divisors, whose sum is σ = 280469640. Its totient is φ = 280469638.

The previous prime is 280469611. The next prime is 280469641. The reversal of 280469639 is 936964082.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280469639 is a prime.

It is a Sophie Germain prime.

Together with 280469641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 280469593 and 280469602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280469669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140234819 + 140234820.

It is an arithmetic number, because the mean of its divisors is an integer number (140234820).

Almost surely, 2^280469639 is an apocalyptic number.

280469639 is a deficient number, since it is larger than the sum of its proper divisors (1).

280469639 is an equidigital number, since it uses as much as digits as its factorization.

280469639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 47.

The square root of 280469639 is about 16747.2278004451. The cubic root of 280469639 is about 654.5788244707.

The spelling of 280469639 in words is "two hundred eighty million, four hundred sixty-nine thousand, six hundred thirty-nine".