280421897 has 4 divisors (see below), whose sum is σ = 320482176. Its totient is φ = 240361620.

The previous prime is 280421879. The next prime is 280421899. The reversal of 280421897 is 798124082.

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 280421897 - 2¹² = 280417801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (280421899) 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, 20030129 + ... + 20030142.

It is an arithmetic number, because the mean of its divisors is an integer number (80120544).

Almost surely, 2^280421897 is an apocalyptic number.

It is an amenable number.

280421897 is a deficient number, since it is larger than the sum of its proper divisors (40060279).

280421897 is an equidigital number, since it uses as much as digits as its factorization.

280421897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40060278.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 280421897 is about 16745.8023695492. The cubic root of 280421897 is about 654.5416812043.

The spelling of 280421897 in words is "two hundred eighty million, four hundred twenty-one thousand, eight hundred ninety-seven".