7220406 has 16 divisors (see below), whose sum is σ = 14481648. Its totient is φ = 2400000.

The previous prime is 7220383. The next prime is 7220407. The reversal of 7220406 is 6040227.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7220407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 906 + ... + 3906.

It is an arithmetic number, because the mean of its divisors is an integer number (905103).

Almost surely, 2^7220406 is an apocalyptic number.

7220406 is an abundant number, since it is smaller than the sum of its proper divisors (7261242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7220406 is a wasteful number, since it uses less digits than its factorization.

7220406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3407.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 7220406 is about 2687.0813162240. The cubic root of 7220406 is about 193.2801287075.

It can be divided in two parts, 7220 and 406, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 7220406 in words is "seven million, two hundred twenty thousand, four hundred six".