1668477 has 4 divisors (see below), whose sum is σ = 2224640. Its totient is φ = 1112316.

The previous prime is 1668473. The next prime is 1668479. The reversal of 1668477 is 7748661.

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 not a de Polignac number, because 1668477 - 2² = 1668473 is a prime.

It is a D-number.

It is a Duffinian number.

1668477 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 3 ways as a sum of consecutive naturals, for example, 278077 + ... + 278082.

It is an arithmetic number, because the mean of its divisors is an integer number (556160).

2^1668477 is an apocalyptic number.

It is an amenable number.

1668477 is a deficient number, since it is larger than the sum of its proper divisors (556163).

1668477 is an equidigital number, since it uses as much as digits as its factorization.

1668477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556162.

The product of its digits is 56448, while the sum is 39.

The square root of 1668477 is about 1291.6953975299. The cubic root of 1668477 is about 118.6060223664.

It can be divided in two parts, 16684 and 77, that added together give a palindrome (16761).

The spelling of 1668477 in words is "one million, six hundred sixty-eight thousand, four hundred seventy-seven".