1666426 has 16 divisors (see below), whose sum is σ = 2592000. Its totient is φ = 803088.

The previous prime is 1666421. The next prime is 1666429. The reversal of 1666426 is 6246661.

It is a super-2 number, since 2×1666426² = 5553951226952, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1666421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8275 + ... + 8473.

It is an arithmetic number, because the mean of its divisors is an integer number (162000).

2^1666426 is an apocalyptic number.

1666426 is a deficient number, since it is larger than the sum of its proper divisors (925574).

1666426 is a wasteful number, since it uses less digits than its factorization.

1666426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333.

The product of its digits is 10368, while the sum is 31.

The square root of 1666426 is about 1290.9012355715. The cubic root of 1666426 is about 118.5574030373.

The spelling of 1666426 in words is "one million, six hundred sixty-six thousand, four hundred twenty-six".