1666698 has 16 divisors (see below), whose sum is σ = 3636576. Its totient is φ = 505040.

The previous prime is 1666657. The next prime is 1666711. The reversal of 1666698 is 8966661.

It is an Ulam number.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12561 + ... + 12692.

It is an arithmetic number, because the mean of its divisors is an integer number (227286).

2^1666698 is an apocalyptic number.

1666698 is an abundant number, since it is smaller than the sum of its proper divisors (1969878).

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

1666698 is a wasteful number, since it uses less digits than its factorization.

1666698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25269.

The product of its digits is 93312, while the sum is 42.

The square root of 1666698 is about 1291.0065840266. The cubic root of 1666698 is about 118.5638531405.

The spelling of 1666698 in words is "one million, six hundred sixty-six thousand, six hundred ninety-eight".