406388 has 12 divisors (see below), whose sum is σ = 715680. Its totient is φ = 201912.

The previous prime is 406381. The next prime is 406397. The reversal of 406388 is 883604.

It is a self number, because there is not a number n which added to its sum of digits gives 406388.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 406388.

It is not an unprimeable number, because it can be changed into a prime (406381) by changing a digit.

406388 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 953 + ... + 1311.

It is an arithmetic number, because the mean of its divisors is an integer number (59640).

2⁴⁰⁶³⁸⁸ is an apocalyptic number.

It is an amenable number.

406388 is a deficient number, since it is larger than the sum of its proper divisors (309292).

406388 is a wasteful number, since it uses less digits than its factorization.

406388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 644 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 406388 is about 637.4856861138. The cubic root of 406388 is about 74.0707869035.

The spelling of 406388 in words is "four hundred six thousand, three hundred eighty-eight".