1620223 has 4 divisors (see below), whose sum is σ = 1767528. Its totient is φ = 1472920.

The previous prime is 1620217. The next prime is 1620233. The reversal of 1620223 is 3220261.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1620223 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1620197 and 1620206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620233) 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, 73636 + ... + 73657.

It is an arithmetic number, because the mean of its divisors is an integer number (441882).

2^1620223 is an apocalyptic number.

1620223 is a deficient number, since it is larger than the sum of its proper divisors (147305).

1620223 is a wasteful number, since it uses less digits than its factorization.

1620223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147304.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1620223 is about 1272.8798057947. The cubic root of 1620223 is about 117.4514179723.

Adding to 1620223 its reverse (3220261), we get a palindrome (4840484).

The spelling of 1620223 in words is "one million, six hundred twenty thousand, two hundred twenty-three".