1668631 has 8 divisors (see below), whose sum is σ = 1741680. Its totient is φ = 1596672.

The previous prime is 1668629. The next prime is 1668647. The reversal of 1668631 is 1368661.

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

It is a cyclic number.

It is not a de Polignac number, because 1668631 - 2¹ = 1668629 is a prime.

It is a super-2 number, since 2×1668631² = 5568658828322, which contains 22 as substring.

It is a Duffinian number.

1668631 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1668593 and 1668602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668031) 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, 4551 + ... + 4903.

It is an arithmetic number, because the mean of its divisors is an integer number (217710).

2^1668631 is an apocalyptic number.

1668631 is a deficient number, since it is larger than the sum of its proper divisors (73049).

1668631 is a wasteful number, since it uses less digits than its factorization.

1668631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545.

The product of its digits is 5184, while the sum is 31.

The square root of 1668631 is about 1291.7550077317. The cubic root of 1668631 is about 118.6096713560.

The spelling of 1668631 in words is "one million, six hundred sixty-eight thousand, six hundred thirty-one".