406618 has 4 divisors (see below), whose sum is σ = 609930. Its totient is φ = 203308.

The previous prime is 406591. The next prime is 406631. The reversal of 406618 is 816604.

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

It can be written as a sum of positive squares in only one way, i.e., 400689 + 5929 = 633^2 + 77^2 .

It is a junction number, because it is equal to n+sod(n) for n = 406592 and 406601.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101653 + ... + 101656.

2⁴⁰⁶⁶¹⁸ is an apocalyptic number.

406618 is a deficient number, since it is larger than the sum of its proper divisors (203312).

406618 is a wasteful number, since it uses less digits than its factorization.

406618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203311.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 406618 is about 637.6660568040. Note that the first 3 decimals coincide. The cubic root of 406618 is about 74.0847580083.

It can be divided in two parts, 406 and 618, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 406618 in words is "four hundred six thousand, six hundred eighteen".