391129228 has 24 divisors (see below), whose sum is σ = 785181600. Its totient is φ = 167000448.

The previous prime is 391129199. The next prime is 391129261. The reversal of 391129228 is 822921193.

It is an unprimeable number.

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, 18433 + ... + 33496.

It is an arithmetic number, because the mean of its divisors is an integer number (32715900).

Almost surely, 2^391129228 is an apocalyptic number.

It is an amenable number.

391129228 is an abundant number, since it is smaller than the sum of its proper divisors (394052372).

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

391129228 is a wasteful number, since it uses less digits than its factorization.

391129228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52209 (or 52207 counting only the distinct ones).

The product of its digits is 15552, while the sum is 37.

The square root of 391129228 is about 19776.9873337675. The cubic root of 391129228 is about 731.3188319262.

The spelling of 391129228 in words is "three hundred ninety-one million, one hundred twenty-nine thousand, two hundred twenty-eight".