1668377 has 4 divisors (see below), whose sum is σ = 1676496. Its totient is φ = 1660260.

The previous prime is 1668361. The next prime is 1668379. The reversal of 1668377 is 7738661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1668377 - 2⁴ = 1668361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1668377.

It is not an unprimeable number, because it can be changed into a prime (1668379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3743 + ... + 4164.

It is an arithmetic number, because the mean of its divisors is an integer number (419124).

2^1668377 is an apocalyptic number.

It is an amenable number.

1668377 is a deficient number, since it is larger than the sum of its proper divisors (8119).

1668377 is an equidigital number, since it uses as much as digits as its factorization.

1668377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8118.

The product of its digits is 42336, while the sum is 38.

The square root of 1668377 is about 1291.6566881335. The cubic root of 1668377 is about 118.6036527724.

The spelling of 1668377 in words is "one million, six hundred sixty-eight thousand, three hundred seventy-seven".