1668953 has 12 divisors (see below), whose sum is σ = 1977444. Its totient is φ = 1399200.

The previous prime is 1668943. The next prime is 1668971. The reversal of 1668953 is 3598661.

1668953 is nontrivially palindromic in base 4.

It can be written as a sum of positive squares in 2 ways, for example, as 644809 + 1024144 = 803^2 + 1012^2 .

It is not a de Polignac number, because 1668953 - 2⁶ = 1668889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1668913) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1043 + ... + 2103.

It is an arithmetic number, because the mean of its divisors is an integer number (164787).

2^1668953 is an apocalyptic number.

1668953 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1668953 is a deficient number, since it is larger than the sum of its proper divisors (308491).

1668953 is a wasteful number, since it uses less digits than its factorization.

1668953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096 (or 1085 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 1668953 is about 1291.8796383565. The cubic root of 1668953 is about 118.6173003360.

It can be divided in two parts, 166 and 8953, that added together give a palindrome (9119).

The spelling of 1668953 in words is "one million, six hundred sixty-eight thousand, nine hundred fifty-three".