406390 has 8 divisors (see below), whose sum is σ = 731520. Its totient is φ = 162552.

The previous prime is 406381. The next prime is 406397. The reversal of 406390 is 93604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20310 + ... + 20329.

It is an arithmetic number, because the mean of its divisors is an integer number (91440).

2⁴⁰⁶³⁹⁰ is an apocalyptic number.

406390 is a deficient number, since it is larger than the sum of its proper divisors (325130).

406390 is a wasteful number, since it uses less digits than its factorization.

406390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40646.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 406390 is about 637.4872547746. The cubic root of 406390 is about 74.0709084141.

Adding to 406390 its reverse (93604), we get a palindrome (499994).

The spelling of 406390 in words is "four hundred six thousand, three hundred ninety".