1668439405 has 8 divisors (see below), whose sum is σ = 2003088384. Its totient is φ = 1334110800.

The previous prime is 1668439391. The next prime is 1668439441. The reversal of 1668439405 is 5049348661.

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

It is not a de Polignac number, because 1668439405 - 2²¹ = 1666342253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68481 + ... + 89590.

It is an arithmetic number, because the mean of its divisors is an integer number (250386048).

Almost surely, 2^1668439405 is an apocalyptic number.

It is an amenable number.

1668439405 is a deficient number, since it is larger than the sum of its proper divisors (334648979).

1668439405 is a wasteful number, since it uses less digits than its factorization.

1668439405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160187.

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 1668439405 is about 40846.5347979483. The cubic root of 1668439405 is about 1186.0513152866.

The spelling of 1668439405 in words is "one billion, six hundred sixty-eight million, four hundred thirty-nine thousand, four hundred five".