280872343 has 4 divisors (see below), whose sum is σ = 293084208. Its totient is φ = 268660480.

The previous prime is 280872289. The next prime is 280872349. The reversal of 280872343 is 343278082.

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-280872343 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 (280872349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6105898 + ... + 6105943.

It is an arithmetic number, because the mean of its divisors is an integer number (73271052).

Almost surely, 2^280872343 is an apocalyptic number.

280872343 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

280872343 is a deficient number, since it is larger than the sum of its proper divisors (12211865).

280872343 is a wasteful number, since it uses less digits than its factorization.

280872343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12211864.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 280872343 is about 16759.2464926082. The cubic root of 280872343 is about 654.8919605033.

The spelling of 280872343 in words is "two hundred eighty million, eight hundred seventy-two thousand, three hundred forty-three".