1606646 has 4 divisors (see below), whose sum is σ = 2409972. Its totient is φ = 803322.

The previous prime is 1606643. The next prime is 1606663. The reversal of 1606646 is 6466061.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×1606646² = 5162622738632, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606643) by changing a digit.

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 as a sum of consecutive naturals, namely, 401660 + ... + 401663.

It is an arithmetic number, because the mean of its divisors is an integer number (602493).

2^1606646 is an apocalyptic number.

1606646 is a deficient number, since it is larger than the sum of its proper divisors (803326).

1606646 is an equidigital number, since it uses as much as digits as its factorization.

1606646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803325.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1606646 is about 1267.5354038448. The cubic root of 1606646 is about 117.1224276716.

The spelling of 1606646 in words is "one million, six hundred six thousand, six hundred forty-six".