280887421 has 4 divisors (see below), whose sum is σ = 281033344. Its totient is φ = 280741500.

The previous prime is 280887407. The next prime is 280887457. The reversal of 280887421 is 124788082.

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 280887421 - 2¹³ = 280879229 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 (280087421) 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, 70035 + ... + 73936.

It is an arithmetic number, because the mean of its divisors is an integer number (70258336).

Almost surely, 2^280887421 is an apocalyptic number.

It is an amenable number.

280887421 is a deficient number, since it is larger than the sum of its proper divisors (145923).

280887421 is a wasteful number, since it uses less digits than its factorization.

280887421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145922.

The product of its (nonzero) digits is 57344, while the sum is 40.

The square root of 280887421 is about 16759.6963277978. The cubic root of 280887421 is about 654.9036790942.

The spelling of 280887421 in words is "two hundred eighty million, eight hundred eighty-seven thousand, four hundred twenty-one".