1620222 has 8 divisors (see below), whose sum is σ = 3240456. Its totient is φ = 540072.

The previous prime is 1620217. The next prime is 1620233. The reversal of 1620222 is 2220261.

It is a sphenic number, since it is the product of 3 distinct primes.

1620222 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 135013 + ... + 135024.

It is an arithmetic number, because the mean of its divisors is an integer number (405057).

2^1620222 is an apocalyptic number.

1620222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1620222 is a wasteful number, since it uses less digits than its factorization.

1620222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270042.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1620222 is about 1272.8794129846. The cubic root of 1620222 is about 117.4513938086.

Adding to 1620222 its reverse (2220261), we get a palindrome (3840483).

The spelling of 1620222 in words is "one million, six hundred twenty thousand, two hundred twenty-two".