280003397 has 2 divisors, whose sum is σ = 280003398. Its totient is φ = 280003396.

The previous prime is 280003369. The next prime is 280003429. The reversal of 280003397 is 793300082.

It is an a-pointer prime, because the next prime (280003429) can be obtained adding 280003397 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 276856321 + 3147076 = 16639^2 + 1774^2 .

It is a cyclic number.

It is not a de Polignac number, because 280003397 - 2²⁰ = 278954821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280003307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140001698 + 140001699.

It is an arithmetic number, because the mean of its divisors is an integer number (140001699).

Almost surely, 2^280003397 is an apocalyptic number.

It is an amenable number.

280003397 is a deficient number, since it is larger than the sum of its proper divisors (1).

280003397 is an equidigital number, since it uses as much as digits as its factorization.

280003397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 280003397 is about 16733.3020351633. The cubic root of 280003397 is about 654.2159076966.

The spelling of 280003397 in words is "two hundred eighty million, three thousand, three hundred ninety-seven".