403966 has 16 divisors (see below), whose sum is σ = 640224. Its totient is φ = 190944.

The previous prime is 403957. The next prime is 403969. The reversal of 403966 is 669304.

403966 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (403969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3871 + ... + 3973.

It is an arithmetic number, because the mean of its divisors is an integer number (40014).

2⁴⁰³⁹⁶⁶ is an apocalyptic number.

403966 is a deficient number, since it is larger than the sum of its proper divisors (236258).

403966 is a wasteful number, since it uses less digits than its factorization.

403966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 403966 is about 635.5831967571. The cubic root of 403966 is about 73.9233440436.

It can be divided in two parts, 403 and 966, that added together give a square (1369 = 37²).

The spelling of 403966 in words is "four hundred three thousand, nine hundred sixty-six".