280403969 has 2 divisors, whose sum is σ = 280403970. Its totient is φ = 280403968.

The previous prime is 280403953. The next prime is 280403993. The reversal of 280403969 is 969304082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 279290944 + 1113025 = 16712^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 280403969 - 2⁴ = 280403953 is a prime.

It is a super-2 number, since 2×280403969² = 157252771661905922, which contains 22 as substring.

It is equal to p_15246797 and since 280403969 and 15246797 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (280400969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140201984 + 140201985.

It is an arithmetic number, because the mean of its divisors is an integer number (140201985).

Almost surely, 2^280403969 is an apocalyptic number.

It is an amenable number.

280403969 is a deficient number, since it is larger than the sum of its proper divisors (1).

280403969 is an equidigital number, since it uses as much as digits as its factorization.

280403969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 280403969 is about 16745.2670626658. The cubic root of 280403969 is about 654.5277321351.

The spelling of 280403969 in words is "two hundred eighty million, four hundred three thousand, nine hundred sixty-nine".