280407121 has 4 divisors (see below), whose sum is σ = 289452544. Its totient is φ = 271361700.

The previous prime is 280407091. The next prime is 280407131. The reversal of 280407121 is 121704082.

It is a happy number.

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 280407121 - 2¹⁹ = 279882833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280407131) 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, 4522665 + ... + 4522726.

It is an arithmetic number, because the mean of its divisors is an integer number (72363136).

Almost surely, 2^280407121 is an apocalyptic number.

It is an amenable number.

280407121 is a deficient number, since it is larger than the sum of its proper divisors (9045423).

280407121 is an equidigital number, since it uses as much as digits as its factorization.

280407121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9045422.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 280407121 is about 16745.3611785473. The cubic root of 280407121 is about 654.5301846249.

The spelling of 280407121 in words is "two hundred eighty million, four hundred seven thousand, one hundred twenty-one".