828472391 has 4 divisors (see below), whose sum is σ = 828553752. Its totient is φ = 828391032.

The previous prime is 828472369. The next prime is 828472399. The reversal of 828472391 is 193274828.

828472391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 828472391 - 2⁶ = 828472327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (828472399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22781 + ... + 46646.

It is an arithmetic number, because the mean of its divisors is an integer number (207138438).

Almost surely, 2^828472391 is an apocalyptic number.

828472391 is a deficient number, since it is larger than the sum of its proper divisors (81361).

828472391 is a wasteful number, since it uses less digits than its factorization.

828472391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81360.

The product of its digits is 193536, while the sum is 44.

The square root of 828472391 is about 28783.1963304981. The cubic root of 828472391 is about 939.2027308765.

The spelling of 828472391 in words is "eight hundred twenty-eight million, four hundred seventy-two thousand, three hundred ninety-one".