280221399 has 12 divisors (see below), whose sum is σ = 405896400. Its totient is φ = 186291744.

The previous prime is 280221371. The next prime is 280221401. The reversal of 280221399 is 993122082.

It is not a de Polignac number, because 280221399 - 2⁸ = 280221143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280221199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40134 + ... + 46595.

It is an arithmetic number, because the mean of its divisors is an integer number (33824700).

Almost surely, 2^280221399 is an apocalyptic number.

280221399 is a deficient number, since it is larger than the sum of its proper divisors (125675001).

280221399 is a wasteful number, since it uses less digits than its factorization.

280221399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87094 (or 87091 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 280221399 is about 16739.8147839216. The cubic root of 280221399 is about 654.3856477552.

The spelling of 280221399 in words is "two hundred eighty million, two hundred twenty-one thousand, three hundred ninety-nine".