280394985 has 32 divisors (see below), whose sum is σ = 484944768. Its totient is φ = 137525760.

The previous prime is 280394929. The next prime is 280394987. The reversal of 280394985 is 589493082.

It is not a de Polignac number, because 280394985 - 2¹² = 280390889 is a prime.

It is a super-2 number, since 2×280394985² = 157242695226300450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (280394987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52645 + ... + 57725.

It is an arithmetic number, because the mean of its divisors is an integer number (15154524).

Almost surely, 2^280394985 is an apocalyptic number.

It is an amenable number.

280394985 is a deficient number, since it is larger than the sum of its proper divisors (204549783).

280394985 is a wasteful number, since it uses less digits than its factorization.

280394985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5385.

The product of its (nonzero) digits is 622080, while the sum is 48.

The square root of 280394985 is about 16744.9988056136. The cubic root of 280394985 is about 654.5207418156.

The spelling of 280394985 in words is "two hundred eighty million, three hundred ninety-four thousand, nine hundred eighty-five".