1668471 has 8 divisors (see below), whose sum is σ = 2542464. Its totient is φ = 953400.

The previous prime is 1668467. The next prime is 1668473. The reversal of 1668471 is 1748661.

It is a happy number.

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

It is not a de Polignac number, because 1668471 - 2² = 1668467 is a prime.

It is a super-3 number, since 3×1668471³ = 13934046074126553333, which contains 333 as substring.

1668471 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668473) 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, 39705 + ... + 39746.

It is an arithmetic number, because the mean of its divisors is an integer number (317808).

2^1668471 is an apocalyptic number.

1668471 is a deficient number, since it is larger than the sum of its proper divisors (873993).

1668471 is an equidigital number, since it uses as much as digits as its factorization.

1668471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79461.

The product of its digits is 8064, while the sum is 33.

The square root of 1668471 is about 1291.6930749989. The cubic root of 1668471 is about 118.6058801934.

The spelling of 1668471 in words is "one million, six hundred sixty-eight thousand, four hundred seventy-one".