280138343 has 4 divisors (see below), whose sum is σ = 280199280. Its totient is φ = 280077408.

The previous prime is 280138319. The next prime is 280138349. The reversal of 280138343 is 343831082.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 280138343 - 2⁶ = 280138279 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 (280138349) 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, 22955 + ... + 32972.

It is an arithmetic number, because the mean of its divisors is an integer number (70049820).

Almost surely, 2^280138343 is an apocalyptic number.

280138343 is a deficient number, since it is larger than the sum of its proper divisors (60937).

280138343 is an equidigital number, since it uses as much as digits as its factorization.

280138343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60936.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 280138343 is about 16737.3338079875. Note that the first 3 decimals coincide. The cubic root of 280138343 is about 654.3209893278.

The spelling of 280138343 in words is "two hundred eighty million, one hundred thirty-eight thousand, three hundred forty-three".