1666974 has 8 divisors (see below), whose sum is σ = 3333960. Its totient is φ = 555656.

The previous prime is 1666943. The next prime is 1666991. The reversal of 1666974 is 4796661.

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

1666974 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138909 + ... + 138920.

It is an arithmetic number, because the mean of its divisors is an integer number (416745).

2^1666974 is an apocalyptic number.

1666974 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1666974 is a wasteful number, since it uses less digits than its factorization.

1666974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277834.

The product of its digits is 54432, while the sum is 39.

The square root of 1666974 is about 1291.1134729372. The cubic root of 1666974 is about 118.5703973809.

It can be divided in two parts, 166 and 6974, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 1666974 in words is "one million, six hundred sixty-six thousand, nine hundred seventy-four".