406646 has 4 divisors (see below), whose sum is σ = 609972. Its totient is φ = 203322.

The previous prime is 406633. The next prime is 406649. The reversal of 406646 is 646604.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101660 + ... + 101663.

It is an arithmetic number, because the mean of its divisors is an integer number (152493).

2⁴⁰⁶⁶⁴⁶ is an apocalyptic number.

406646 is a deficient number, since it is larger than the sum of its proper divisors (203326).

406646 is a wasteful number, since it uses less digits than its factorization.

406646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203325.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 406646 is about 637.6880114915. The cubic root of 406646 is about 74.0864584787.

The spelling of 406646 in words is "four hundred six thousand, six hundred forty-six".