863521406 has 16 divisors (see below), whose sum is σ = 1417315968. Its totient is φ = 391320600.

The previous prime is 863521403. The next prime is 863521441. The reversal of 863521406 is 604125368.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863521403) 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 7 ways as a sum of consecutive naturals, for example, 52010 + ... + 66573.

It is an arithmetic number, because the mean of its divisors is an integer number (88582248).

Almost surely, 2^863521406 is an apocalyptic number.

863521406 is a deficient number, since it is larger than the sum of its proper divisors (553794562).

863521406 is a wasteful number, since it uses less digits than its factorization.

863521406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118927.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 863521406 is about 29385.7347364329. The cubic root of 863521406 is about 952.2647374450.

The spelling of 863521406 in words is "eight hundred sixty-three million, five hundred twenty-one thousand, four hundred six".