280938813 has 16 divisors (see below), whose sum is σ = 393285120. Its totient is φ = 178043184.

The previous prime is 280938809. The next prime is 280938871. The reversal of 280938813 is 318839082.

It is not a de Polignac number, because 280938813 - 2² = 280938809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280938893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1243 + ... + 23736.

It is an arithmetic number, because the mean of its divisors is an integer number (24580320).

Almost surely, 2^280938813 is an apocalyptic number.

280938813 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

280938813 is a deficient number, since it is larger than the sum of its proper divisors (112346307).

280938813 is a wasteful number, since it uses less digits than its factorization.

280938813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25168.

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 280938813 is about 16761.2294596787. The cubic root of 280938813 is about 654.9436177018.

The spelling of 280938813 in words is "two hundred eighty million, nine hundred thirty-eight thousand, eight hundred thirteen".