1606440 has 64 divisors (see below), whose sum is σ = 5261760. Its totient is φ = 389120.

The previous prime is 1606439. The next prime is 1606457. The reversal of 1606440 is 446061.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 712 + ... + 1928.

It is an arithmetic number, because the mean of its divisors is an integer number (82215).

2^1606440 is an apocalyptic number.

1606440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1606440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2630880).

1606440 is an abundant number, since it is smaller than the sum of its proper divisors (3655320).

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

1606440 is a wasteful number, since it uses less digits than its factorization.

1606440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242 (or 1238 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1606440 is about 1267.4541411822. The cubic root of 1606440 is about 117.1174217459.

The spelling of 1606440 in words is "one million, six hundred six thousand, four hundred forty".