1660406 has 16 divisors (see below), whose sum is σ = 2757888. Its totient is φ = 743400.

The previous prime is 1660387. The next prime is 1660409. The reversal of 1660406 is 6040661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660409) 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, 1031 + ... + 2093.

It is an arithmetic number, because the mean of its divisors is an integer number (172368).

2^1660406 is an apocalyptic number.

1660406 is a deficient number, since it is larger than the sum of its proper divisors (1097482).

1660406 is a wasteful number, since it uses less digits than its factorization.

1660406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1660406 is about 1288.5674215966. The cubic root of 1660406 is about 118.4144670507.

The spelling of 1660406 in words is "one million, six hundred sixty thousand, four hundred six".