1664222 has 8 divisors (see below), whose sum is σ = 2852976. Its totient is φ = 713232.

The previous prime is 1664123. The next prime is 1664227. The reversal of 1664222 is 2224661.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664227) 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, 59423 + ... + 59450.

It is an arithmetic number, because the mean of its divisors is an integer number (356622).

2^1664222 is an apocalyptic number.

1664222 is a deficient number, since it is larger than the sum of its proper divisors (1188754).

1664222 is a wasteful number, since it uses less digits than its factorization.

1664222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118882.

The product of its digits is 1152, while the sum is 23.

The square root of 1664222 is about 1290.0472859551. The cubic root of 1664222 is about 118.5051123267.

Adding to 1664222 its reverse (2224661), we get a palindrome (3888883).

The spelling of 1664222 in words is "one million, six hundred sixty-four thousand, two hundred twenty-two".