1606638 has 24 divisors (see below), whose sum is σ = 3533544. Its totient is φ = 486640.

The previous prime is 1606603. The next prime is 1606639. The reversal of 1606638 is 8366061.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606639) 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 in 11 ways as a sum of consecutive naturals, for example, 381 + ... + 1832.

It is an arithmetic number, because the mean of its divisors is an integer number (147231).

2^1606638 is an apocalyptic number.

1606638 is an abundant number, since it is smaller than the sum of its proper divisors (1926906).

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

1606638 is a wasteful number, since it uses less digits than its factorization.

1606638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2240 (or 2229 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 1606638 is about 1267.5322481105. The cubic root of 1606638 is about 117.1222332747.

The spelling of 1606638 in words is "one million, six hundred six thousand, six hundred thirty-eight".