280139120 has 20 divisors (see below), whose sum is σ = 651323640. Its totient is φ = 112055616.

The previous prime is 280139081. The next prime is 280139131. The reversal of 280139120 is 21931082.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 280139120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1750790 + ... + 1750949.

It is an arithmetic number, because the mean of its divisors is an integer number (32566182).

Almost surely, 2^280139120 is an apocalyptic number.

280139120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

280139120 is an abundant number, since it is smaller than the sum of its proper divisors (371184520).

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

280139120 is a wasteful number, since it uses less digits than its factorization.

280139120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501752 (or 3501746 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 280139120 is about 16737.3570195536. The cubic root of 280139120 is about 654.3215942752.

The spelling of 280139120 in words is "two hundred eighty million, one hundred thirty-nine thousand, one hundred twenty".