1601616 has 40 divisors (see below), whose sum is σ = 4213024. Its totient is φ = 524160.

The previous prime is 1601609. The next prime is 1601617. The reversal of 1601616 is 6161061.

It is a super-2 number, since 2×1601616² = 5130347622912, which contains 22 as substring.

1601616 is a modest number, since divided by 1616 gives 160 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1601592 and 1601601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601617) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2655 + ... + 3201.

2^1601616 is an apocalyptic number.

1601616 is a gapful number since it is divisible by the number (16) 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 1601616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2106512).

1601616 is an abundant number, since it is smaller than the sum of its proper divisors (2611408).

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

1601616 is a wasteful number, since it uses less digits than its factorization.

1601616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619 (or 613 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 1601616 is about 1265.5496829441. The cubic root of 1601616 is about 117.0000730513. Note that the first 4 decimals are identical.

Adding to 1601616 its reverse (6161061), we get a palindrome (7762677).

The spelling of 1601616 in words is "one million, six hundred one thousand, six hundred sixteen".