1616885 has 4 divisors (see below), whose sum is σ = 1940268. Its totient is φ = 1293504.

The previous prime is 1616861. The next prime is 1616891. The reversal of 1616885 is 5886161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5886161 = 347 ⋅16963.

It can be written as a sum of positive squares in 2 ways, for example, as 628849 + 988036 = 793^2 + 994^2 .

It is a cyclic number.

It is not a de Polignac number, because 1616885 - 2⁶ = 1616821 is a prime.

It is a super-2 number, since 2×1616885² = 5228634206450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 161684 + ... + 161693.

It is an arithmetic number, because the mean of its divisors is an integer number (485067).

2^1616885 is an apocalyptic number.

It is an amenable number.

1616885 is a deficient number, since it is larger than the sum of its proper divisors (323383).

1616885 is an equidigital number, since it uses as much as digits as its factorization.

1616885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323382.

The product of its digits is 11520, while the sum is 35.

The square root of 1616885 is about 1271.5679297623. The cubic root of 1616885 is about 117.3707043136.

The spelling of 1616885 in words is "one million, six hundred sixteen thousand, eight hundred eighty-five".