406438 has 8 divisors (see below), whose sum is σ = 615888. Its totient is φ = 201144.

The previous prime is 406423. The next prime is 406447. The reversal of 406438 is 834604.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781 + ... + 1192.

It is an arithmetic number, because the mean of its divisors is an integer number (76986).

2⁴⁰⁶⁴³⁸ is an apocalyptic number.

406438 is a deficient number, since it is larger than the sum of its proper divisors (209450).

406438 is a wasteful number, since it uses less digits than its factorization.

406438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 406438 is about 637.5249014744. The cubic root of 406438 is about 74.0738245485.

The spelling of 406438 in words is "four hundred six thousand, four hundred thirty-eight".