280138012 has 24 divisors (see below), whose sum is σ = 611210880. Its totient is φ = 109144560.

The previous prime is 280138007. The next prime is 280138013. The reversal of 280138012 is 210831082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280138013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454462 + ... + 455077.

It is an arithmetic number, because the mean of its divisors is an integer number (25467120).

Almost surely, 2^280138012 is an apocalyptic number.

280138012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

280138012 is an abundant number, since it is smaller than the sum of its proper divisors (331072868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280138012 is a wasteful number, since it uses less digits than its factorization.

280138012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909561 (or 909559 counting only the distinct ones).

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

The square root of 280138012 is about 16737.3239199103. The cubic root of 280138012 is about 654.3207316214.

Adding to 280138012 its reverse (210831082), we get a palindrome (490969094).

The spelling of 280138012 in words is "two hundred eighty million, one hundred thirty-eight thousand, twelve".