280280139 has 16 divisors (see below), whose sum is σ = 412895232. Its totient is φ = 168215168.

The previous prime is 280280131. The next prime is 280280167. The reversal of 280280139 is 931082082.

It is a cyclic number.

It is not a de Polignac number, because 280280139 - 2³ = 280280131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (280280131) 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, 118299 + ... + 120644.

It is an arithmetic number, because the mean of its divisors is an integer number (25805952).

Almost surely, 2^280280139 is an apocalyptic number.

280280139 is a deficient number, since it is larger than the sum of its proper divisors (132615093).

280280139 is a wasteful number, since it uses less digits than its factorization.

280280139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238986.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 280280139 is about 16741.5691916857. The cubic root of 280280139 is about 654.4313686596.

The spelling of 280280139 in words is "two hundred eighty million, two hundred eighty thousand, one hundred thirty-nine".