4218406 has 4 divisors (see below), whose sum is σ = 6327612. Its totient is φ = 2109202.

The previous prime is 4218377. The next prime is 4218413. The reversal of 4218406 is 6048124.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054600 + ... + 1054603.

It is an arithmetic number, because the mean of its divisors is an integer number (1581903).

Almost surely, 2^4218406 is an apocalyptic number.

4218406 is a deficient number, since it is larger than the sum of its proper divisors (2109206).

4218406 is a wasteful number, since it uses less digits than its factorization.

4218406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109205.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 4218406 is about 2053.8758482440. The cubic root of 4218406 is about 161.5782097780.

It can be divided in two parts, 4218 and 406, that added together give a square (4624 = 68²).

The spelling of 4218406 in words is "four million, two hundred eighteen thousand, four hundred six".