1668722 has 16 divisors (see below), whose sum is σ = 2761344. Its totient is φ = 750000.

The previous prime is 1668721. The next prime is 1668727. The reversal of 1668722 is 2278661.

It is a super-2 number, since 2×1668722² = 5569266226568, which contains 22 as substring.

It is a nialpdrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (1668721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1847 + ... + 2597.

It is an arithmetic number, because the mean of its divisors is an integer number (172584).

2^1668722 is an apocalyptic number.

1668722 is a deficient number, since it is larger than the sum of its proper divisors (1092622).

1668722 is a wasteful number, since it uses less digits than its factorization.

1668722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865.

The product of its digits is 8064, while the sum is 32.

The square root of 1668722 is about 1291.7902306489. The cubic root of 1668722 is about 118.6118274716.

It can be divided in two parts, 166 and 8722, that added together give a palindrome (8888).

The spelling of 1668722 in words is "one million, six hundred sixty-eight thousand, seven hundred twenty-two".