280012381 has 4 divisors (see below), whose sum is σ = 305468064. Its totient is φ = 254556700.

The previous prime is 280012361. The next prime is 280012399. The reversal of 280012381 is 183210082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 280012381 - 2⁵ = 280012349 is a prime.

It is a super-2 number, since 2×280012381² = 156813867026578322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280012331) 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, 12727825 + ... + 12727846.

It is an arithmetic number, because the mean of its divisors is an integer number (76367016).

Almost surely, 2^280012381 is an apocalyptic number.

It is an amenable number.

280012381 is a deficient number, since it is larger than the sum of its proper divisors (25455683).

280012381 is a wasteful number, since it uses less digits than its factorization.

280012381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25455682.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 280012381 is about 16733.5704797273. The cubic root of 280012381 is about 654.2229045318. Note that the first 3 decimals are identical.

The spelling of 280012381 in words is "two hundred eighty million, twelve thousand, three hundred eighty-one".