1667646 has 12 divisors (see below), whose sum is σ = 3613272. Its totient is φ = 555876.

The previous prime is 1667641. The next prime is 1667647. The reversal of 1667646 is 6467661.

1667646 is a `hidden beast` number, since 1 + 6 + 6 + 7 + 646 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1667646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1667641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46306 + ... + 46341.

It is an arithmetic number, because the mean of its divisors is an integer number (301106).

2^1667646 is an apocalyptic number.

1667646 is an abundant number, since it is smaller than the sum of its proper divisors (1945626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1667646 is a wasteful number, since it uses less digits than its factorization.

1667646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92655 (or 92652 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 1667646 is about 1291.3736872029. The cubic root of 1667646 is about 118.5863281638.

The spelling of 1667646 in words is "one million, six hundred sixty-seven thousand, six hundred forty-six".