280012397 has 4 divisors (see below), whose sum is σ = 320014176. Its totient is φ = 240010620.

The previous prime is 280012361. The next prime is 280012399. The reversal of 280012397 is 793210082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 280012397 - 2⁶ = 280012333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280012399) 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 in 3 ways as a sum of consecutive naturals, for example, 20000879 + ... + 20000892.

It is an arithmetic number, because the mean of its divisors is an integer number (80003544).

Almost surely, 2^280012397 is an apocalyptic number.

It is an amenable number.

280012397 is a deficient number, since it is larger than the sum of its proper divisors (40001779).

280012397 is an equidigital number, since it uses as much as digits as its factorization.

280012397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40001778.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 280012397 is about 16733.5709578081. The cubic root of 280012397 is about 654.2229169926. Note that the first 3 decimals are identical.

The spelling of 280012397 in words is "two hundred eighty million, twelve thousand, three hundred ninety-seven".