280730421 has 8 divisors (see below), whose sum is σ = 415896960. Its totient is φ = 187153596.

The previous prime is 280730407. The next prime is 280730423. The reversal of 280730421 is 124037082.

It is not a de Polignac number, because 280730421 - 2⁷ = 280730293 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 10397423 = 280730421 / (2 + 8 + 0 + 7 + 3 + 0 + 4 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280730423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5198685 + ... + 5198738.

It is an arithmetic number, because the mean of its divisors is an integer number (51987120).

Almost surely, 2^280730421 is an apocalyptic number.

It is an amenable number.

280730421 is a deficient number, since it is larger than the sum of its proper divisors (135166539).

280730421 is a wasteful number, since it uses less digits than its factorization.

280730421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10397432 (or 10397426 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 280730421 is about 16755.0118173638. The cubic root of 280730421 is about 654.7816384560.

The spelling of 280730421 in words is "two hundred eighty million, seven hundred thirty thousand, four hundred twenty-one".