403856 has 20 divisors (see below), whose sum is σ = 802032. Its totient is φ = 196896.

The previous prime is 403849. The next prime is 403861. The reversal of 403856 is 658304.

It is an unprimeable number.

403856 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395 + ... + 981.

2⁴⁰³⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

403856 is a deficient number, since it is larger than the sum of its proper divisors (398176).

403856 is a wasteful number, since it uses less digits than its factorization.

403856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638 (or 632 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 403856 is about 635.4966561674. The cubic root of 403856 is about 73.9166336554.

It can be divided in two parts, 4038 and 56, that multiplied together give a triangular number (226128 = T₆₇₂).

The spelling of 403856 in words is "four hundred three thousand, eight hundred fifty-six".