280947923 has 4 divisors (see below), whose sum is σ = 284905008. Its totient is φ = 276990840.

The previous prime is 280947917. The next prime is 280947929. The reversal of 280947923 is 329749082.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (280947917) and next prime (280947929).

It is a cyclic number.

It is not a de Polignac number, because 280947923 - 2¹⁰ = 280946899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280947929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1978436 + ... + 1978577.

It is an arithmetic number, because the mean of its divisors is an integer number (71226252).

Almost surely, 2^280947923 is an apocalyptic number.

280947923 is a deficient number, since it is larger than the sum of its proper divisors (3957085).

280947923 is an equidigital number, since it uses as much as digits as its factorization.

280947923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3957084.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 280947923 is about 16761.5012155833. The cubic root of 280947923 is about 654.9506969086.

The spelling of 280947923 in words is "two hundred eighty million, nine hundred forty-seven thousand, nine hundred twenty-three".