1620229 has 4 divisors (see below), whose sum is σ = 1744876. Its totient is φ = 1495584.

The previous prime is 1620217. The next prime is 1620233. The reversal of 1620229 is 9220261.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1004004 + 616225 = 1002^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620229 - 2¹¹ = 1618181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62304 + ... + 62329.

It is an arithmetic number, because the mean of its divisors is an integer number (436219).

2^1620229 is an apocalyptic number.

It is an amenable number.

1620229 is a deficient number, since it is larger than the sum of its proper divisors (124647).

1620229 is a wasteful number, since it uses less digits than its factorization.

1620229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124646.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1620229 is about 1272.8821626529. The cubic root of 1620229 is about 117.4515629539.

It can be divided in two parts, 1620 and 229, that added together give a square (1849 = 43²).

The spelling of 1620229 in words is "one million, six hundred twenty thousand, two hundred twenty-nine".