280613923 has 4 divisors (see below), whose sum is σ = 286584480. Its totient is φ = 274643368.

The previous prime is 280613909. The next prime is 280613987. The reversal of 280613923 is 329316082.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-280613923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (280614923) 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, 2985208 + ... + 2985301.

It is an arithmetic number, because the mean of its divisors is an integer number (71646120).

Almost surely, 2^280613923 is an apocalyptic number.

280613923 is a deficient number, since it is larger than the sum of its proper divisors (5970557).

280613923 is an equidigital number, since it uses as much as digits as its factorization.

280613923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5970556.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 280613923 is about 16751.5349445954. The cubic root of 280613923 is about 654.6910517819.

The spelling of 280613923 in words is "two hundred eighty million, six hundred thirteen thousand, nine hundred twenty-three".